Bug 2555850 (CVE-2026-112300)

Summary:	CVE-2026-112300 configobj: configobj: Denial of Service via inefficient regular expression evaluation
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:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in configobj. A remote attacker can trigger a Denial of Service (DoS) by supplying specially crafted configuration input to be parsed by the application. Due to inefficient regular expression evaluation in the _sectionmarker function, processing this input causes excessive CPU consumption and application unresponsiveness.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2556201
Bug Blocks:

Description OSIDB Bzimport 2026-10-19 20:52:51 UTC

A vulnerability was identified in DiffSK configobj up to 5.0.9. Affected by this vulnerability is the function _sectionmarker of the file configobj/__init__.py. The manipulation leads to inefficient regular expression complexity. Remote exploitation of the attack is possible. The project was informed of the problem early through an issue report but has not responded yet.