Bug 2431791

Summary:	CVE-2026-0865 python3.11: wsgiref.headers.Headers allows header newline injection in Python [fedora-42]
Product:	[Fedora] Fedora	Reporter:	Jon Moroney <jmoroney>
Component:	python3.11	Assignee:	Tomáš Hrnčiar <thrnciar>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	42	CC:	cstratak, mhroncok, python-maint, python-packagers-sig, thrnciar, torsava, vstinner
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["6e7fbe35-87b4-456a-ab91-8fa1b5a8024b"]}
Fixed In Version:	python3.11-3.11.14-5.fc42	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-03-07 00:50:57 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:	2431367

Description Jon Moroney 2026-01-21 20:25:59 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 Tomáš Hrnčiar 2026-02-10 10:54:13 UTC

PR: https://src.fedoraproject.org/rpms/python3.11/pull-request/218

Comment 2 Fedora Update System 2026-02-26 10:33:39 UTC

FEDORA-2026-8fa5a66a49 (python3.11-3.11.14-5.fc42) has been submitted as an update to Fedora 42.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8fa5a66a49

Comment 3 Fedora Update System 2026-02-27 02:25:01 UTC

FEDORA-2026-8fa5a66a49 has been pushed to the Fedora 42 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-8fa5a66a49`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8fa5a66a49

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

Comment 4 Fedora Update System 2026-03-07 00:50:57 UTC

FEDORA-2026-8fa5a66a49 (python3.11-3.11.14-5.fc42) has been pushed to the Fedora 42 stable repository.
If problem still persists, please make note of it in this bug report.