{"kind": "product", "path": "vulns/ubuntu-26.10/nltk", "name": "nltk", "product": "nltk", "ecosystem": "Ubuntu:26.10", "items": [{"id": "CVE-2026-109956", "noindex": false, "published": "2026-10-13T13:27:20.244Z", "modified": "2026-10-13T13:27:20.244Z", "cvss": 8.3, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.00318, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-109956", "title": "NLTK through 3.10.3 Path Traversal via WekaClassifier Model Path", "description": "NLTK through 3.10.3 contains a path traversal vulnerability in WekaClassifier that allows attackers to bypass nltk.pathsec containment by supplying unvalidated model paths. Attackers controlling the model_filename or model argument can make the weka JVM write files via -d or probe files via -l outside allowed data roots.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-j456-xh4h-cpf2", "https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-wekaclassifier-model-path", "https://nvd.nist.gov/vuln/detail/CVE-2026-109956"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-81726", "noindex": false, "published": "2026-08-27T14:51:18.838Z", "modified": "2026-08-27T19:29:23.489Z", "cvss": 8.3, "cvss_vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.00339, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-81726", "title": "NLTK through 3.10.3 Path Traversal via Model-Artifact APIs", "description": "NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp", "https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis", "https://nvd.nist.gov/vuln/detail/CVE-2026-81726"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-70626", "noindex": false, "published": "2026-08-22T14:12:44.983Z", "modified": "2026-08-24T19:49:30.565Z", "cvss": 8.6, "cvss_vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.002, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-70626", "title": "NLTK before 3.9.4 Symlink Escape via CorpusReader", "description": "NLTK versions before 3.9.4 contain a symlink escape vulnerability in CorpusReader.open() that allows local attackers to read arbitrary files outside the corpus root. The vulnerability exists because path validation is lexical and does not account for symlink resolution, enabling attackers to place symlinks inside the corpus root to access files outside the intended boundary.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9", "https://www.vulncheck.com/advisories/nltk-before-symlink-escape-via-corpusreader", "https://nvd.nist.gov/vuln/detail/CVE-2026-70626"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-65915", "noindex": false, "published": "2026-08-22T14:12:41.391Z", "modified": "2026-08-24T19:20:52.747Z", "cvss": 7.1, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.0041, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-65915", "title": "NLTK before 3.10.0 Arbitrary File Read via FileSystemPathPointer", "description": "NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-72r2-7mfr-5xr9", "https://www.vulncheck.com/advisories/nltk-before-arbitrary-file-read-via-filesystempathpointer", "https://nvd.nist.gov/vuln/detail/CVE-2026-65915"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-63312", "noindex": false, "published": "2026-08-22T14:12:40.731Z", "modified": "2026-08-24T18:34:55.320Z", "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": 0.00651, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-63312", "title": "NLTK StreamBackedCorpusView Bypasses pathsec.ENFORCE Arbitrary File Read", "description": "NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open() directly instead of pathsec.open(). Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting, including sensitive system files and application credentials.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-x5ph-mj9p-rfr8", "https://www.vulncheck.com/advisories/nltk-streambackedcorpusview-bypasses-pathsec-enforce-arbitrary-file-read", "https://nvd.nist.gov/vuln/detail/CVE-2026-63312"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-63311", "noindex": false, "published": "2026-08-22T14:12:40.063Z", "modified": "2026-08-26T16:16:26.704Z", "cvss": 6.9, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L", "severity": "medium", "epss": 0.00334, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-63311", "title": "NLTK before 3.10.0 SSRF via DNS Resolution Failure", "description": "NLTK before 3.10.0 (affected versions <= 3.9.4) contains a server-side request forgery (SSRF) vulnerability in the validate_network_url() function in nltk/pathsec.py. The _resolve_hostname() helper catches OSError and ValueError during socket.getaddrinfo() and returns an empty list; when DNS resolution fails, the validation loop executes no IP checks and the function fails open, allowing urlopen() to proceed without validation. An attacker who can trigger DNS resolution failures or use DNS rebinding can bypass SSRF protections and reach restricted network resources, including cloud metadata endpoints (e.g., 169.254.169.254).", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-3gqm-fcw5-w839", "https://www.vulncheck.com/advisories/nltk-before-ssrf-via-dns-resolution-failure", "https://nvd.nist.gov/vuln/detail/CVE-2026-63311"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-62388", "noindex": false, "published": "2026-08-22T14:12:38.647Z", "modified": "2026-08-29T11:47:32.048Z", "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": 0.00512, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-62388", "title": "NLTK before 3.10.0 Insecure Default Configuration in pathsec.py", "description": "NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only active when manually enabled.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-p3m8-78j2-g5p3", "https://www.vulncheck.com/advisories/nltk-before-insecure-default-configuration-pathsec", "https://nvd.nist.gov/vuln/detail/CVE-2026-62388"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-62385", "noindex": false, "published": "2026-08-22T14:12:37.962Z", "modified": "2026-08-24T19:07:55.247Z", "cvss": 8.2, "cvss_vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.0042, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-62385", "title": "NLTK 3.9.4 Path Traversal via FrameNet and NKJP Readers", "description": "NLTK versions before 3.10.0 contain a path traversal vulnerability in FramenetCorpusReader and NKJPCorpusReader that allows attackers to parse XML files outside the corpus root by supplying unsafe selectors or poisoned index state. Attackers can exploit frame_by_name, doc, lu, and header methods with crafted parameters to read arbitrary XML files accessible to the application.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-568f-pv23-39p4", "https://www.vulncheck.com/advisories/nltk-path-traversal-via-framenet-and-nkjp-readers", "https://nvd.nist.gov/vuln/detail/CVE-2026-62385"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-62384", "noindex": false, "published": "2026-08-22T14:12:37.283Z", "modified": "2026-08-24T18:39:40.142Z", "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": 0.00651, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-62384", "title": "NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2", "description": "NLTK versions before 3.10.2 contain a symlink-based sandbox bypass in FramenetCorpusReader that allows attackers to read arbitrary XML files outside the corpus root. Attackers can place symlinks with names containing no path separators inside the corpus subdirectory, which pass the path validation guard and are resolved to files outside the intended corpus root when accessed via frame_by_name(), _lu_file(), or doc() methods.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-f833-7jw8-xwrv", "https://www.vulncheck.com/advisories/nltk-framenetcorpusreader-symlink-sandbox-bypass-before", "https://nvd.nist.gov/vuln/detail/CVE-2026-62384"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-62383", "noindex": false, "published": "2026-08-22T14:12:36.606Z", "modified": "2026-08-26T16:16:35.172Z", "cvss": 6.8, "cvss_vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "severity": "medium", "epss": 0.00183, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-62383", "title": "nltk IPIPANCorpusReader Symlink Arbitrary File Read", "description": "nltk versions before 3.10.2 contain a symlink-based arbitrary file read vulnerability in IPIPANCorpusReader methods that bypass nltk.pathsec validation entirely. Attackers can place a symlink in the corpus root directory and read arbitrary files accessible to the process by calling channels(), domains(), categories(), or fileids() methods with the symlink filename.", "references": ["https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6", "https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read", "https://nvd.nist.gov/vuln/detail/CVE-2026-62383"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-71514", "noindex": false, "published": "2026-08-22T13:34:08.493Z", "modified": "2026-08-24T19:18:14.123Z", "cvss": 2, "cvss_vector": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "severity": "low", "epss": 0.00171, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-71514", "title": "NLTK 3.9.4 through 3.10.2 Path Traversal via CrubadanCorpusReader pathsec Bypass", "description": "NLTK 3.9.4 through 3.10.2 contains a path traversal vulnerability in CrubadanCorpusReader. _load_lang_ngrams joins the corpus root with crubadan_code, the column-0 value read from the corpus table.txt mapping file, and opens the result with the builtin open() rather than the pathsec-validated opener, so os.path.join discards the root when that value is absolute and the read escapes the corpus directory without the containment check nltk.pathsec applies when ENFORCE is set. An attacker who controls a corpus package can disclose file contents outside the corpus root through lang_freq, limited to paths ending in -3grams.txt whose contents parse ", "references": ["https://github.com/nltk/nltk/commit/10d34b3f4fe3fec74b76527a409eb0acbac2e8ab", "https://github.com/nltk/nltk", "https://github.com/nltk/nltk/blob/v3.10.2/nltk/corpus/reader/crubadan.py#L90-L98"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-71513", "noindex": false, "published": "2026-08-22T13:34:07.811Z", "modified": "2026-08-27T16:24:50.539Z", "cvss": 8.7, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "severity": "high", "epss": 0.01097, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-71513", "title": "NLTK 3.10.0 through 3.10.2 Remote Code Execution via AllowlistUnpickler Dotted-Name Bypass", "description": "NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft untrusted transition-parser models that execute arbitrary commands when TransitionParser.parse loads the model through allowlisted_pickle_load.", "references": ["https://github.com/nltk/nltk/commit/c3e37113742a1ebeeb4f2ca58941f320f98805ea", "https://github.com/nltk/nltk", "https://github.com/nltk/nltk/blob/v3.10.2/nltk/picklesec.py#L119-L124"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-72818", "noindex": false, "published": "2026-08-20T21:57:34.230Z", "modified": "2026-09-24T14:18:57.476Z", "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": 0.00742, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-72818", "title": "NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input", "description": "The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORD_RE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix [a-z0-9]+(?:[.\\-][a-z0-9]+)* is unbounded. Input consisting of many alternating label separators can be partitioned in exponentially many ways, and because the branch also requires a trailing top-level domain that such input never supplies, the engine explores those partitions before failing at each offset. A few kilobytes of input therefore consumes seconds to minutes of single-threaded CPU, and the HANG_RE substitution performed before matching does not ", "references": ["https://github.com/nltk/nltk/issues/3704", "https://github.com/nltk/nltk/blob/3.9.4/nltk/tokenize/casual.py", "https://github.com/nltk/nltk/releases/tag/v3.10.1"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12876", "noindex": false, "published": "2026-08-14T00:00:00Z", "modified": "2026-10-17T12:58:05.123379474Z", "cvss": null, "cvss_vector": "", "severity": "unknown", "epss": null, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12876", "title": "UBUNTU-CVE-2026-12876", "description": "[Unknown description]", "references": ["https://ubuntu.com/security/CVE-2026-12876", "https://www.cve.org/CVERecord?id=CVE-2026-12876", "https://github.com/nltk/nltk/security/advisories/GHSA-ff5c-cp5c-9wjf"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12841", "noindex": false, "published": "2026-08-14T00:00:00Z", "modified": "2026-10-17T12:58:04.916552825Z", "cvss": null, "cvss_vector": "", "severity": "unknown", "epss": null, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12841", "title": "UBUNTU-CVE-2026-12841", "description": "[Unknown description]", "references": ["https://ubuntu.com/security/CVE-2026-12841", "https://www.cve.org/CVERecord?id=CVE-2026-12841", "https://osv.dev/vulnerability/UBUNTU-CVE-2026-12841"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12074", "noindex": false, "published": "2026-08-13T00:00:00Z", "modified": "2026-10-17T12:58:05.156849199Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": null, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12074", "title": "UBUNTU-CVE-2026-12074", "description": "[Unknown description]", "references": ["https://ubuntu.com/security/CVE-2026-12074", "https://www.cve.org/CVERecord?id=CVE-2026-12074", "https://github.com/nltk/nltk/security/advisories/GHSA-xh95-f55m-82fw"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12072", "noindex": false, "published": "2026-08-13T00:00:00Z", "modified": "2026-10-17T12:58:04.881003637Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": null, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12072", "title": "UBUNTU-CVE-2026-12072", "description": "[Unknown description]", "references": ["https://ubuntu.com/security/CVE-2026-12072", "https://www.cve.org/CVERecord?id=CVE-2026-12072", "https://github.com/nltk/nltk/security/advisories/GHSA-6hm5-jgcp-p838"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12061", "noindex": false, "published": "2026-08-13T00:00:00Z", "modified": "2026-10-17T12:58:04.815075324Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": null, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12061", "title": "UBUNTU-CVE-2026-12061", "description": "[Unknown description]", "references": ["https://ubuntu.com/security/CVE-2026-12061", "https://www.cve.org/CVERecord?id=CVE-2026-12061", "https://github.com/nltk/nltk/security/advisories/GHSA-fg7f-2386-8897"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12372", "noindex": false, "published": "2026-08-09T22:45:52.799Z", "modified": "2026-08-12T17:48:54.679Z", "cvss": 3.7, "cvss_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "severity": "low", "epss": 0.0026, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12372", "title": "Server-Side Request Forgery (SSRF) in nltk/nltk", "description": "A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The `nltk.pathsec.validate_network_url()` function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space (`100.64.0.0/10`). This occurs because Python's `ipaddress` module does not classify such addresses as `is_private` or `is_global`, and the current guard only checks `is_private` and a few explicit categories. An attacker who can influence a URL passed to NLTK's network-loading helpers can exploit this vulnerability to make a strict-mode application send ", "references": ["https://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db", "https://nvd.nist.gov/vuln/detail/CVE-2026-12372"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-12261", "noindex": false, "published": "2026-08-07T06:25:10.976Z", "modified": "2026-08-07T15:27:19.025Z", "cvss": 5.3, "cvss_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N", "severity": "medium", "epss": 0.00211, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-12261", "title": "Improper Access Control in nltk/nltk", "description": "A vulnerability in `nltk.downloader` in nltk/nltk versions <= 3.9.4 allows for cross-package resource and model poisoning. The downloader extracts package archives into shared namespaces such as `corpora/` and `taggers/` instead of package-isolated roots, and validates package integrity only after the archive has been written and extracted. This design flaw enables one package to overwrite another package's trusted resources within the same namespace, making the changes immediately active through ordinary NLTK APIs. This issue persists across fresh interpreter restarts and can affect downstream workflows, including machine learning pipelines ", "references": ["https://huntr.com/bounties/8b8c381e-08a8-4e4f-bb46-a320c96a364f", "https://nvd.nist.gov/vuln/detail/CVE-2026-12261"], "fixes": [], "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}]}], "total": 31, "unknown_count": 0, "release_unconfirmed": false, "page": 1, "pages": 2, "filtered": false, "noindex": false, "filters": {}, "page_size": 20, "products": [{"name": "nltk", "path": "vulns/ubuntu-26.10/nltk", "ecosystem": "Ubuntu:26.10"}], "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": "2026-10-17T12:58:05.156849199Z", "early_advisories": [], "license": "You may freely use the PatchFirst selection and our additions (priorities, early warnings, texts, summaries and aggregates) for your own purposes, including internal business use. Resale, commercial distribution and bulk mirroring of this selection or these additions require a written agreement with the operator. Whenever you use or publish the selection or our additions, credit PatchFirst (https://patchfirst.dev/vulns/) with this link to the regional feed page. Original records from open sources remain subject to their respective licenses and terms. These conditions do not restrict your rights to the original data, which you can obtain directly from those sources.", "terms_url": "https://patchfirst.dev/vulns/#feed-terms", "attribution": {"name": "PatchFirst", "url": "https://patchfirst.dev/vulns/"}, "source_changes": "Records are selected, normalized and combined by PatchFirst; summaries and translations may be added. News is credited with a link to the original source in each entry.", "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. DISCLAIMERS ALL DOCUMENTS AND THE INFORMATION CONTAINED THEREIN PROVIDED BY MITRE ARE PROVIDED ON AN \"AS IS\" BASIS AND THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE MITRE CORPORATION, ITS BOARD OF TRUSTEES, OFFICERS, AGENTS, AND EMPLOYEES, DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION THEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."}, {"id": "osv", "name": "OSV", "url": "https://osv.dev/", "terms_url": "https://google.github.io/osv.dev/data/", "terms": "Upstream licenses vary; see the source catalog."}, {"id": "kev", "name": "CISA KEV", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "license": "CC0-1.0", "terms_url": "https://github.com/cisagov/kev-data/blob/develop/LICENSE"}, {"id": "epss", "name": "FIRST EPSS", "url": "https://www.first.org/epss/", "terms_url": "https://www.first.org/epss/faq", "terms": "Free public scores; attribution requested (FIRST EPSS, scores generated by Empirical Security)."}, {"id": "github-advisory", "name": "GitHub Advisory Database", "url": "https://github.com/advisories", "license": "CC-BY-4.0", "terms_url": "https://github.com/github/advisory-database/blob/main/LICENSE.md"}, {"id": "exploitdb", "name": "Exploit-DB", "url": "https://www.exploit-db.com/", "license": "GPL-2.0", "terms_url": "https://gitlab.com/exploit-database/exploitdb/-/blob/main/LICENSE.md"}, {"id": "metasploit", "name": "Metasploit", "url": "https://github.com/rapid7/metasploit-framework", "license": "BSD-3-Clause", "terms_url": "https://github.com/rapid7/metasploit-framework/blob/master/LICENSE", "notice": "Copyright (c) 2006-2026, Rapid7, Inc.\nLicense: BSD-3-clause\n Redistribution and use in source and binary forms, with or without modification,\n are permitted provided that the following conditions are met:\n .\n * Redistributions of source code must retain the above copyright notice,\n this list of conditions and the following disclaimer.\n .\n * Redistributions in binary form must reproduce the above copyright notice,\n this list of conditions and the following disclaimer in the documentation\n and/or other materials provided with the distribution.\n .\n * Neither the name of Rapid7, Inc. nor the names of its contributors\n may be used to endorse or promote products derived from this software\n without specific prior written permission.\n .\n THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND\n ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n DISCLAIMED. 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