Bug 2444869 - CVE-2025-69534 python-markdown: denial of service via malformed HTML-like sequences [fedora-all]
Summary: CVE-2025-69534 python-markdown: denial of service via malformed HTML-like seq...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: python-markdown
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Thomas Moschny
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["26f7fbcd-e064-4fc1-bae4-6...
Depends On:
Blocks: CVE-2025-69534
TreeView+ depends on / blocked
 
Reported: 2026-03-05 18:51 UTC by Guilherme de Almeida Suckevicz
Modified: 2026-03-14 19:26 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-03-14 19:26:36 UTC
Type: ---
Embargoed:

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Description Guilherme de Almeida Suckevicz 2026-03-05 18:51:48 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Comment 1 Thomas Moschny 2026-03-06 08:43:35 UTC 
To my understanding, we are not affected:

- Fedora 43 and later have python-markdown-3.10.2-1 
- Fedora 42 has python-markdown-3.7-4, so _could_ be affected, but:
- https://github.com/Python-Markdown/markdown/issues/1534#issuecomment-2984185675 states that this is actually caused by a bug in the standard lib's HTMLParser (see cpython#77057), which should also be fixed.

Checking on Fedora 42 (with python3-3.13.12-1.fc42.x86_64, python3-markdown-3.7-4.fc42.noarch):

$ python -c 'import markdown; markdown.markdown("<![")'

does not crash.

Any comments?
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