Bug 2542397

Summary:	CVE-2026-101017 opendmarc: OpenDMARC: Denial of Service via NULL pointer dereference during subdomain walking in opendmarc_policy.c [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Laura Pardo <lpardo>
Component:	opendmarc	Assignee:	Kevin Fenzi <kevin>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	abo, kevin, mikel
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["8b7b3a5b-4f8b-4681-a2f0-76a93753c2bb"]}
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2542380

Description Laura Pardo 2026-09-28 10:36:08 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.

A vulnerability was found in Trusted Domain Project OpenDMARC up to 1.4.2. This vulnerability affects the function strcasecmp in the library libopendmarc/opendmarc_policy.c. The manipulation results in handling of exceptional conditions. The attack can be executed remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.