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Vulnerability · Published Sep 27, 2026 · Assigned by VulDB

CVE-2026-100889Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one

High 7.3

In plain English

A high-severity security flaw in OpenDKIM from Trusted Domain Project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.3%top 77.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12opendkimno fix listedDEBIAN-CVE-2026-100889
Debian:13opendkimno fix listedDEBIAN-CVE-2026-100889
Debian:14opendkimno fix listedDEBIAN-CVE-2026-100889
Ubuntu:22.04:LTSopendkimno fix listedUBUNTU-CVE-2026-100889
Ubuntu:24.04:LTSopendkimno fix listedUBUNTU-CVE-2026-100889
Ubuntu:26.04:LTSopendkimno fix listedUBUNTU-CVE-2026-100889
Ubuntu:26.10opendkimno fix listedUBUNTU-CVE-2026-100889

Affected products (as reported)

VendorProductVersions
Trusted Domain Project OpenDKIM 2.02.12.22.32.42.52.62.7

Weakness: CWE-193, CWE-189 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C

References