Bug 2444869

Summary: CVE-2025-69534 python-markdown: denial of service via malformed HTML-like sequences [fedora-all]
Product: [Fedora] Fedora Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: python-markdownAssignee: Thomas Moschny <thomas.moschny>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: thomas.moschny
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["26f7fbcd-e064-4fc1-bae4-664210c2fe03"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-03-14 19:26:36 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2444839    

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?