Bug 2542253 (CVE-2026-100889)

Summary: CVE-2026-100889 opendkim: opendkim: Denial of Service via off-by-one error in dkim_qp_decode
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenDKIM. An off-by-one boundary error in the quoted-printable decoder function (dkim_qp_decode) allows a remote attacker to trigger memory corruption by submitting specially crafted input. This issue primarily causes the application to crash, leading to a Denial of Service (DoS).
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Bug Depends On: 2542278, 2542279    
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Description OSIDB Bzimport 2026-09-27 23:51:15 UTC 
A vulnerability was detected in Trusted Domain Project OpenDKIM up to 2.11.0. Affected is the function dkim_qp_decode of the file util.c of the component Decoder. The manipulation results in off-by-one. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.