Bug 2542895 (CVE-2026-101278)

Summary: CVE-2026-101278 opendmarc: OpenDMARC: Origin validation bypass via PSL wildcard handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenDMARC. A remote attacker can supply manipulated domain names to trigger an origin validation error when processing wildcard entries in the Public Suffix List (PSL). This flaw affects the domain extraction routine and may allow an attacker to bypass domain verification checks.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2542949, 2542951    
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Description OSIDB Bzimport 2026-09-29 01:01:35 UTC 
A weakness has been identified in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_get_tld of the file libopendmarc/opendmarc_tld.c : of the component PSL Wildcard Handler. Executing a manipulation can lead to origin validation error. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.