Bug 2498687

Summary:	CVE-2026-15308 python3.13: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Jon Moroney <jmoroney>
Component:	python3.13	Assignee:	Python Maintainers <python-maint>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	45	CC:	ksurma, mhroncok, python-maint, python-packagers-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["e4e01e88-5029-4403-9e37-e412899c09b1"]}
Fixed In Version:	python3.13-3.13.15-1.fc45 python3.13-3.13.15-1.fc46 python3.13-3.13.15-1.fc43 python3.13-3.13.15-1.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-21 04:51:02 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:	2498608

Description Jon Moroney 2026-07-09 20:09:36 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 Fedora Update System 2026-08-12 18:52:58 UTC

FEDORA-2026-d2906e4778 (python3.13-3.13.15-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d2906e4778

Comment 2 Fedora Update System 2026-08-12 18:52:58 UTC

FEDORA-2026-b39628a3c3 (python3.13-3.13.15-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-b39628a3c3

Comment 3 Fedora Update System 2026-08-13 01:47:42 UTC

FEDORA-2026-d2906e4778 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-d2906e4778`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d2906e4778

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-08-13 02:11:04 UTC

FEDORA-2026-b39628a3c3 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-b39628a3c3`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-b39628a3c3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Aoife Moloney 2026-08-17 15:16:41 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 6 Fedora Update System 2026-08-21 04:51:02 UTC

FEDORA-2026-b39628a3c3 (python3.13-3.13.15-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-08-21 05:18:44 UTC

FEDORA-2026-d2906e4778 (python3.13-3.13.15-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.