Bug 2542368 (CVE-2026-101014)

Summary: CVE-2026-101014 opendmarc: OpenDMARC: Denial of Service via off-by-one error in opendmarc_util_cleanup
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenDMARC. An off-by-one boundary error exists in the DMARC (Domain-based Message Authentication, Reporting, and Conformance) record parser during cleanup operations in the opendmarc_util_cleanup function. A remote attacker could exploit this vulnerability by submitting specially crafted records, potentially leading to a Denial of Service (DoS) or memory corruption.
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Bug Depends On: 2542419, 2542420    
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Description OSIDB Bzimport 2026-09-28 08:42:11 UTC 
A vulnerability was detected in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_util_cleanup in the library libopendmarc/opendmarc_util.c of the component DMARC Record Parser. Performing a manipulation results in off-by-one. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named b3b1da9264bc80324094a27c71e7369bdedc62ae. To fix this issue, it is recommended to deploy a patch.