Bug 2431367 (CVE-2026-0865)

Summary:	CVE-2026-0865 cpython: wsgiref.headers.Headers allows header newline injection in Python
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bbrownin, dfreiber, drow, gotiwari, jburrell, jgrulich, jhorak, ljawale, luizcosta, mvyas, nweather, rbobbitt, teagle, tpopela, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	Missing newline filtering has been discovered in Python. User-controlled header names and values containing newlines can allow injecting HTTP headers.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2431754, 2431766, 2431813, 2431758, 2431761, 2431781, 2431788, 2431791, 2431793, 2431797, 2431800, 2431802, 2431805, 2431810, 2431818, 2431821, 2431826, 2431830, 2431835, 2431838, 2431842, 2431845, 2431848
Bug Blocks:

Description OSIDB Bzimport 2026-01-20 22:01:52 UTC

User-controlled header names and values containing newlines can allow injecting HTTP headers.

Comment 2 errata-xmlrpc 2026-02-05 15:34:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:2128 https://access.redhat.com/errata/RHSA-2026:2128

Comment 4 errata-xmlrpc 2026-03-12 12:27:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:4463 https://access.redhat.com/errata/RHSA-2026:4463

Comment 5 errata-xmlrpc 2026-03-12 13:30:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:4473 https://access.redhat.com/errata/RHSA-2026:4473

Comment 6 errata-xmlrpc 2026-03-17 10:33:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:4713 https://access.redhat.com/errata/RHSA-2026:4713

Comment 7 errata-xmlrpc 2026-03-31 09:03:11 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:6253 https://access.redhat.com/errata/RHSA-2026:6253