Bug 2491892 (CVE-2026-0864)

Summary:	CVE-2026-0864 python: cpython: Python configparser: Configuration injection via crafted multi-line input
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bbrownin, cahl, dfreiber, dkeler, drow, dschmidt, gbenhaim, jburrell, jlanda, kshier, ljawale, msilmser, niyer, rhel-process-autobot, sdawley, simaishi, stcannon, suppawar, teagle, thason, twaugh, vkumar, watson-tool-maintainers, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Python `configparser` module. When writing configuration files, an attacker who controls the input value can inject unexpected keys and values. This occurs if the input contains multi-line text with carriage return characters, leading to potential configuration manipulation.	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:	2492018, 2492020, 2524892, 2524901
Bug Blocks:

Description OSIDB Bzimport 2026-06-23 19:01:26 UTC

When using the "configparser" module to write configuration files
containing multi-line text values with carriage return characters (\r) the
resulting file could be injected with unexpected keys and values if the
attacker controls the written value.