Bug 2498688 - CVE-2026-15308 python3.12: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations [fedora-all]
Summary: CVE-2026-15308 python3.12: Python: CPU Denial of Service in HTML parser via r...
Keywords:
Status: POST
Alias: None
Product: Fedora
Classification: Fedora
Component: python3.12
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Lukáš Zachar
QA Contact:
URL:
Whiteboard: {"flaws": ["e4e01e88-5029-4403-9e37-e...
Depends On:
Blocks: CVE-2026-15308
TreeView+ depends on / blocked
 
Reported: 2026-07-09 20:09 UTC by Jon Moroney
Modified: 2026-07-20 15:00 UTC (History)
6 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
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Description Jon Moroney 2026-07-09 20:09:40 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.

The incremental HTML parser (html.parser.HTMLParser) allows for CPU
denial-of-service through repeated unterminated markup declarations when
processing uncontrolled data.
Comment 1 Lukáš Zachar 2026-07-20 15:00:16 UTC 
PRs:
https://src.fedoraproject.org/rpms/python3.12/pull-request/226
https://src.fedoraproject.org/rpms/python3.12/pull-request/227
https://src.fedoraproject.org/rpms/python3.12/pull-request/228
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