CVE-2019-25781
CVE-2019-25781 · Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.
CVSS 8.7 · High · EPSS 0.4%
- Published
- Updated
Affected products and versions
markdown
- Versions
- ≥ 3.0, ≤ 3.11.2: Affected (custom)
No fix published
Original sources
- https://github.com/Python-Markdown/markdown/issues/798
- https://github.com/Python-Markdown/markdown
- https://github.com/Python-Markdown/markdown/issues/1654
- https://github.com/Python-Markdown/markdown/blob/b41e0aaf1181f1a8cb200cf5a815aad7c0020d23/markdown/inlinepatterns.py#L1155-L1172
- https://www.vulncheck.com/advisories/python-markdown-3.0-through-3.11.2-denial-of-service-via-link-bracket-parsing
- https://nvd.nist.gov/vuln/detail/CVE-2019-25781