Vulnerability in Trusted Domain Project Opendkim
CVE-2026-100889
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.
Published .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Trusted Domain Project Opendkim — versions 2.0, 2.1, 2.10
Weakness classification (CWE)
References
- vuldb.com/vuln/410839 (technical-description, vdb-entry)
- vuldb.com/vuln/410839/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-100889 (third-party-advisory)
- vuldb.com/submit/917063 (third-party-advisory)
- weitongli.com/share/opendkim-qp-off-by-one.html (exploit)
Frequently asked questions
- What is CVE-2026-100889?
- CVE-2026-100889 is a high-severity vulnerability in Trusted Domain Project Opendkim, classified under CWE-189. CVSS score: 7.3/10. Published 2026-09-28.
- How severe is CVE-2026-100889?
- High severity. CVSS v3 base score is 7.3 out of 10.