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

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-28 · updated 2026-09-28
Weakness: CWE-189

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 products

Trusted Domain Project OpenDKIM: 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 (+6)

References

https://vuldb.com/cve/CVE-2026-100889
https://vuldb.com/submit/917063
https://vuldb.com/vuln/410839
https://vuldb.com/vuln/410839/cti
https://weitongli.com/share/opendkim-qp-off-by-one.html

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