Bug 2542894 (CVE-2026-101279)

Summary: CVE-2026-101279 opendmarc: opendmarc: Denial of service via integer overflow in policy parser
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 exploit this vulnerability by supplying a crafted Domain-based Message Authentication, Reporting, and Conformance (DMARC) policy record containing an invalid percentage (pct) value. This manipulation causes an integer overflow during policy parsing, potentially leading to improper policy enforcement or a Denial of Service (DoS).
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Bug Depends On: 2542952, 2542953    
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Description OSIDB Bzimport 2026-09-29 01:01:29 UTC 
A security vulnerability has been detected in Trusted Domain Project OpenDMARC up to 1.4.2. This impacts an unknown function of the file libopendmarc/opendmarc_policy.c of the component DMARC Parser. The manipulation of the argument pct leads to integer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.