| Name | CVE-2025-69534 |
| Description | Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pypy3 (PTS) | bullseye | 7.3.5+dfsg-2+deb11u2 | vulnerable |
| bullseye (security) | 7.3.5+dfsg-2+deb11u5 | vulnerable | |
| bookworm | 7.3.11+dfsg-2+deb12u3 | vulnerable | |
| trixie | 7.3.19+dfsg-2 | vulnerable | |
| sid, forky | 7.3.20+dfsg-4 | vulnerable | |
| python2.7 (PTS) | bullseye | 2.7.18-8+deb11u1 | vulnerable |
| python3.11 (PTS) | bookworm | 3.11.2-6+deb12u6 | vulnerable |
| bookworm (security) | 3.11.2-6+deb12u3 | vulnerable | |
| python3.13 (PTS) | trixie | 3.13.5-2 | fixed |
| sid, forky | 3.13.12-1 | fixed | |
| python3.14 (PTS) | sid, forky | 3.14.3-1 | fixed |
| python3.9 (PTS) | bullseye | 3.9.2-1 | vulnerable |
| bullseye (security) | 3.9.2-1+deb11u5 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| jython2.7 | source | (unstable) | (unfixed) | |||
| pypy3 | source | (unstable) | (unfixed) | |||
| python2.7 | source | (unstable) | (unfixed) | |||
| python3.11 | source | (unstable) | (unfixed) | |||
| python3.13 | source | (unstable) | 3.13.4-1 | |||
| python3.14 | source | (unstable) | (not affected) | |||
| python3.9 | source | (unstable) | (unfixed) |
- python3.14 <not-affected> (Fixed before initial upload to Debian unstable)
While reported against python-markdown, the actual issue in in Python itself
https://github.com/Python-Markdown/markdown/issues/1534
https://github.com/python/cpython/issues/77057
https://github.com/python/cpython/commit/76c0b01bc401c3e976011bbc69cec56dbebe0ad5 (v3.15.0a1)
https://github.com/python/cpython/commit/381159b2beabbd6b3c0babe4d7ba7fbdeb23ce06 (v3.14.0b2)
https://github.com/python/cpython/commit/aa0c3d1098e7fdcc74b753aadf18dd07ddbc76b0 (v3.13.4)