Bug 2433822

Summary:	CVE-2026-1299 python3.9: email header injection due to unquoted newlines [fedora-42]
Product:	[Fedora] Fedora	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	python3.9	Assignee:	Tomáš Hrnčiar <thrnciar>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
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": ["48870374-6f50-4713-90f2-84e5d5758b4a"]}
Fixed In Version:	python3.9-3.9.25-6.fc42	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-02-28 01:24:54 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:	2432437

Description Guilherme de Almeida Suckevicz 2026-01-28 13:52:18 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 13:59:48 UTC

PR: https://src.fedoraproject.org/rpms/python3.9/pull-request/231

Comment 2 Fedora Update System 2026-02-19 08:22:15 UTC

FEDORA-2026-cad5404d98 (python3.9-3.9.25-6.fc42) has been submitted as an update to Fedora 42.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-cad5404d98

Comment 3 Fedora Update System 2026-02-20 01:54:03 UTC

FEDORA-2026-cad5404d98 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-cad5404d98`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-cad5404d98

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

Comment 4 Fedora Update System 2026-02-28 01:24:54 UTC

FEDORA-2026-cad5404d98 (python3.9-3.9.25-6.fc42) has been pushed to the Fedora 42 stable repository.
If problem still persists, please make note of it in this bug report.