{"kind": "product", "path": "vulns/pypi/mistune", "name": "mistune", "product": "mistune", "ecosystem": "PyPI", "items": [{"id": "CVE-2026-115355", "noindex": false, "published": "2026-10-22T19:13:31.904Z", "modified": "2026-10-22T19:13:31.904Z", "cvss": 8.7, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.00461, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-115355", "title": "Mistune before 3.3.0 Path Traversal and XSS via Include Directive", "description": "Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read arbitrary files by supplying ../ sequences in include paths. Attackers can also inject HTML through unescaped error messages and included file contents to perform cross-site scripting even when escape=True is set.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-h7ww-273w-6cm8", "https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-and-xss-via-include-directive", "https://nvd.nist.gov/vuln/detail/CVE-2026-115355"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-76098", "noindex": false, "published": "2026-08-24T20:05:00.932Z", "modified": "2026-08-24T20:17:07.057Z", "cvss": 7.5, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "severity": "high", "epss": 0.00488, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-76098", "title": "Mistune has Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown", "description": "Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.render_token() can exceed Python's recursion limit and raise RecursionError, allowing crafted Markdown to crash a parsing process. This issue is fixed in version 3.3.3", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq", "https://github.com/lepture/mistune/commit/0938fb7", "https://nvd.nist.gov/vuln/detail/CVE-2026-76098"], "fixes": ["3.3.3"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59927", "noindex": false, "published": "2026-07-08T16:24:37.985Z", "modified": "2026-07-08T19:45:20.799Z", "cvss": 5.3, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "severity": "medium", "epss": 0.00529, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59927", "title": "Mistune directives/include: mutual `.. include::` recursion crashes the renderer with `RecursionError`, denial of service via two attacker-controlled markdown files", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-8mpj-m6qm-5qr8", "https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59928", "noindex": false, "published": "2026-07-08T16:23:21.000Z", "modified": "2026-07-08T19:40:43.968Z", "cvss": 7.5, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "severity": "high", "epss": 0.00651, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59928", "title": "Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing many repeated or distinct reference-link definitions causes quadratic work in src/mistune/block_parser.py and the ref_links environment dictionary handling, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-ffq3-xpv3-j92q", "https://github.com/lepture/mistune/commit/2b04d7ba341c16ac78fe82d3076bdd5c3de87c69", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59924", "noindex": false, "published": "2026-07-08T16:22:11.116Z", "modified": "2026-07-08T17:10:47.834Z", "cvss": 5.9, "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "severity": "medium", "epss": 0.00462, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59924", "title": "Mistune: Arbitrary File Read via Include directive path traversal", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf", "https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59929", "noindex": false, "published": "2026-07-08T16:20:38.139Z", "modified": "2026-07-09T14:41:36.793Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00341, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59929", "title": "Mistune renderers/html.safe_url: HARMFUL_PROTOCOLS list misses legacy and chained schemes that historically chain to `javascript:` execution", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-qfrw-5rxm-mhh2", "https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59925", "noindex": false, "published": "2026-07-08T16:18:43.786Z", "modified": "2026-07-08T19:44:48.084Z", "cvss": 7.5, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "severity": "high", "epss": 0.00644, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59925", "title": "inline_parser: quadratic-time parsing on long runs of `**x**` and `***x***` emphasis pairs", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, long sequences of well-formed double-asterisk or triple-asterisk emphasis pairs around a character cause quadratic work in src/mistune/inline_parser.py because the parser scans forward for matching close markers from every potential opening run, allowing denial of service in default Mistune parsing. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-4j32-57v6-6g45", "https://github.com/lepture/mistune/commit/5de41fb8e527004dbc363e047a3c380c9288c74f", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59926", "noindex": false, "published": "2026-07-08T16:16:15.681Z", "modified": "2026-07-08T19:40:52.229Z", "cvss": 5.3, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N", "severity": "medium", "epss": 0.00327, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59926", "title": "Mistune: XSS via unescaped class option in Admonition directive", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-g97x-gvcm-x72h", "https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2", "https://github.com/lepture/mistune/releases/tag/v3.2.1"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59923", "noindex": false, "published": "2026-07-08T16:14:39.266Z", "modified": "2026-07-08T16:41:52.111Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00348, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59923", "title": "Mistune: XSS via percent-encoded javascript URI bypass in safe_url()", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, HTMLRenderer.safe_url() does not block percent-encoded javascript URIs, allowing attacker-supplied Markdown links or images to bypass URL protections and execute script in rendered HTML. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-8c25-4j27-2rv3", "https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59930", "noindex": false, "published": "2026-07-08T16:13:21.999Z", "modified": "2026-07-09T13:54:33.627Z", "cvss": 4.3, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "severity": "medium", "epss": 0.00192, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59930", "title": "Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id=\"toc_N\"` content", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id=\"toc_N\" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9", "https://github.com/lepture/mistune/commit/c4093c4742ed0d10d9332fb8edb455869b7b581b", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-59922", "noindex": false, "published": "2026-07-08T16:12:00.545Z", "modified": "2026-07-09T14:40:22.315Z", "cvss": 7.5, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "severity": "high", "epss": 0.00644, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-59922", "title": "Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq", "https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7", "https://github.com/lepture/mistune/releases/tag/v3.3.0"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-49851", "noindex": false, "published": "2026-06-24T17:05:33.602Z", "modified": "2026-08-28T12:04:23.106Z", "cvss": 8.7, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.0063, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-49851", "title": "Mistune: Potential DoS via quadratic-time parsing in parse_link_text", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Mistune is vulnerable to a CPU exhaustion DoS due to superlinear (approximately O(n²)) behavior in parse_link_text. When parsing Markdown containing many consecutive [ characters, parse_link_text repeatedly scans the input using a regex search inside a loop. Each iteration re-scans a large portion of the remaining string, resulting in quadratic-time behavior. An attacker-controlled Markdown input can therefore trigger excessive CPU usage with a very small payload. This vulnerability is fixed in 3.3.0.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-qcq2-496w-v96p", "https://access.redhat.com/security/cve/CVE-2026-49851", "https://bugzilla.redhat.com/show_bug.cgi?id=2492304"], "fixes": ["3.3.0"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-44898", "noindex": false, "published": "2026-05-26T20:41:53.805Z", "modified": "2026-05-27T17:57:38.643Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00228, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-44898", "title": "Mistune TOC Anchor Injection XSS", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() builds a <ul> table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href=\"#<id>\") and the text value (used as the visible link label) are inserted into <a> tags via a plain Python format string — with no HTML escaping applied to either value. When heading IDs are derived from user-supplied heading text (the standard use-case for readable slug anchors), an attacker can craft a heading whose text breaks out of the href=\"#...\" attribute context, injecting arbitrary HTML tags including <script> blocks directly into ", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-6269-cqxg-mhhv", "https://github.com/lepture/mistune/releases/tag/v3.2.1", "https://nvd.nist.gov/vuln/detail/CVE-2026-44898"], "fixes": ["3.2.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}, {"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-44897", "noindex": false, "published": "2026-05-26T20:40:42.290Z", "modified": "2026-06-01T17:09:12.432Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00228, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-44897", "title": "Mistune Heading ID Attribute Injection XSS", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening <hN> tag by string-concatenating the id attribute value directly into the HTML — with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character \" in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-v87v-83h2-53w7", "https://github.com/lepture/mistune/releases/tag/v3.2.1", "https://nvd.nist.gov/vuln/detail/CVE-2026-44897"], "fixes": ["3.2.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-44708", "noindex": false, "published": "2026-05-26T20:39:18.990Z", "modified": "2026-05-27T14:14:26.074Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00228, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-44708", "title": "Mistune Math Plugin XSS Escape Bypass", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the mistune math plugin renders inline math ($...$) and block math ($$...$$) by concatenating the raw user-supplied content directly into the HTML output without any HTML escaping. This occurs even when the parser is explicitly created with escape=True, which is supposed to guarantee that all user-controlled text is sanitised before reaching the DOM. This vulnerability is fixed in 3.2.1.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-8g87-j6q8-g93x", "https://github.com/lepture/mistune/releases/tag/v3.2.1", "https://nvd.nist.gov/vuln/detail/CVE-2026-44708"], "fixes": ["3.2.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}, {"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-44899", "noindex": false, "published": "2026-05-26T20:36:40.461Z", "modified": "2026-05-27T13:31:02.744Z", "cvss": 4.7, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N", "severity": "medium", "epss": 0.00228, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-44899", "title": "Mistune Image Directive CSS Injection Vulnerability", "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin validates the :width: and :height: options with a regex compiled as _num_re = re.compile(r\"^\\d+(?:\\.\\d*)?\"). When the validated value is not a plain integer, render_block_image() inserts it directly into a style=\"width:...;\" or style=\"height:...;\" attribute. Because the value was accepted by the prefix-only regex, any CSS after the leading digits reaches the style= attribute verbatim and without escaping. This vulnerability is fixed in 3.2.1.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-ccfx-mfmx-2fx9", "https://github.com/lepture/mistune/releases/tag/v3.2.1", "https://nvd.nist.gov/vuln/detail/CVE-2026-44899"], "fixes": ["3.2.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}, {"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-44896", "noindex": false, "published": "2026-05-26T20:33:38.696Z", "modified": "2026-06-08T23:34:02.448Z", "cvss": 5.3, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N", "severity": "medium", "epss": 0.00198, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-44896", "title": "Mistune: XSS via unescaped figclass/figwidth in Figure directive", "description": "Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer. Version 3.2.1 contains a patch.", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-58cw-g322-p94v", "https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2", "https://nvd.nist.gov/vuln/detail/CVE-2026-44896"], "fixes": ["3.2.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}, {"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2026-33079", "noindex": false, "published": "2026-05-06T17:25:09.026Z", "modified": "2026-08-28T12:04:18.949Z", "cvss": 8.7, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.00528, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2026-33079", "title": "Mistune ReDoS in LINK_TITLE_RE allows denial of service with crafted Markdown titles", "description": "In versions 3.0.0a1 through 3.2.0 of Mistune, there is a ReDoS (Regular Expression Denial of Service) vulnerability in `LINK_TITLE_RE` that allows an attacker who can supply Markdown for parsing to cause denial of service. The regular expression used for parsing link titles contains overlapping alternatives that can trigger catastrophic backtracking. In both the double-quoted and single-quoted branches, a backslash followed by punctuation can be matched either as an escaped punctuation sequence or as two ordinary characters, creating an ambiguous pattern inside a repeated group. If an attacker supplies Markdown containing repeated ! sequences", "references": ["https://github.com/lepture/mistune/security/advisories/GHSA-8mp2-v27r-99xp", "https://github.com/lepture/mistune/blob/df23edd60b43b639d2e6760ef9dd3d618aa11c21/src/mistune/helpers.py#L20-L25", "https://access.redhat.com/security/cve/CVE-2026-33079"], "fixes": ["3.2.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2022-34749", "noindex": false, "published": "2022-07-25T00:00:00.000Z", "modified": "2024-08-03T09:22:10.438Z", "cvss": 8.8, "cvss_vector": "", "severity": "high", "epss": 0.01617, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2022-34749", "title": "CVE-2022-34749", "description": "In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.", "references": ["https://github.com/lepture/mistune/releases", "https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2", "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/"], "fixes": ["2.0.3"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}, {"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}, {"id": "CVE-2017-16876", "noindex": false, "published": "2017-12-29T15:00:00.000Z", "modified": "2024-08-05T20:35:21.320Z", "cvss": 6.1, "cvss_vector": "", "severity": "medium", "epss": 0.02235, "kev": false, "exploits": [], "stacks": [{"name": "python", "path": "vulns/stack/python", "slug": "python"}], "path": "vulns/cve-2017-16876", "title": "CVE-2017-16876", "description": "Cross-site scripting (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the \"key\" argument.", "references": ["https://github.com/lepture/mistune/blob/master/CHANGES.rst", "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC/", "https://github.com/lepture/mistune/commit/5f06d724bc05580e7f203db2d4a4905fc1127f98"], "fixes": ["0.8.1"], "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}, {"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}]}], "total": 21, "unknown_count": 0, "release_unconfirmed": false, "page": 1, "pages": 2, "filtered": false, "noindex": false, "filters": {}, "page_size": 20, "products": [{"name": "mistune", "path": "vulns/pypi/mistune", "ecosystem": "PyPI"}], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}, {"name": "web", "path": "vulns/stack/web", "slug": "web"}, {"name": "php", "path": "vulns/stack/php", "slug": "php"}, {"name": "python", "path": "vulns/stack/python", "slug": "python"}, {"name": "node", "path": "vulns/stack/node", "slug": "node"}, {"name": "database", "path": "vulns/stack/database", "slug": "database"}, {"name": "containers", "path": "vulns/stack/containers", "slug": "containers"}, {"name": "network", "path": "vulns/stack/network", "slug": "network"}, {"name": "applications", "path": "vulns/stack/applications", "slug": "applications"}], "versions": [], "stats": {"recent": 1, "kev": 0}, "lastmod": "2026-10-22T19:13:31.904Z", "early_advisories": [], "license": "Sie dürfen die Auswahl von PatchFirst und unsere Ergänzungen (Prioritäten, Frühwarnungen, Texte, Zusammenfassungen und Aggregate) für eigene Zwecke einschließlich interner geschäftlicher Aufgaben frei nutzen. Weiterverkauf, kommerzielle Verbreitung und massenhafte Spiegelung dieser Auswahl oder Ergänzungen erfordern eine schriftliche Vereinbarung mit dem Betreiber. Nennen Sie bei jeder Nutzung oder Veröffentlichung der Auswahl oder unserer Ergänzungen PatchFirst (https://patchfirst.dev/vulns/) mit diesem Link zur Feedseite Ihrer Region als Quelle. Originaleinträge aus offenen Quellen unterliegen weiterhin ihren jeweiligen Lizenzen und Bedingungen. Diese Bedingungen beschränken Ihre Rechte an den Originaldaten nicht, die Sie direkt bei den Quellen beziehen können.", "terms_url": "https://patchfirst.dev/de/vulns/#feed-terms", "attribution": {"name": "PatchFirst", "url": "https://patchfirst.dev/vulns/"}, "source_changes": "PatchFirst wählt Einträge aus, normalisiert und kombiniert sie; Zusammenfassungen und Übersetzungen können hinzukommen. Nachrichten werden im jeweiligen Eintrag mit einem Link zur Originalquelle belegt.", "sources": [{"id": "cve", "name": "CVE List / CVE.org", "url": "https://www.cve.org/", "license": "CVE Terms of Use", "terms_url": "https://www.cve.org/Legal/TermsOfUse", "notice": "Copyright © 1999–2021, The MITRE Corporation. LICENSE Submissions : For all materials you submit to the Common Vulnerabilities and Exposures (CVE™), you hereby grant to The MITRE Corporation (MITRE) and all CVE Numbering Authorities (CNAs) a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute such materials and derivative works. Unless required by applicable law or agreed to in writing, you provide such materials on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. CVE Usage : MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy. 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