CVE-2026-100889
HighCVSS 7.3Summary
Vulnerability in Trusted Domain Project OpenDKIM up to version 2.11.0 in the dkim_qp_decode function of util.c in the Decoder component. Manipulation leads to off-by-one error. Remote attack possible, exploit public.
Risk Assessment
Off-by-one error may lead to improper memory read or write, potentially allowing an attacker to execute code or cause a crash.
Recommendation
Upgrade OpenDKIM to the latest version or apply vendor patches.
Other vulnerabilities in OpenDKIM
See all- CVE-2026-101277Medium
A security flaw has been discovered in Trusted Domain Project OpenDKIM up to 2.11.0. The impacted element is the function dkim_process_set of the file dkim.c of the component Tag Tokenizer. Performing a manipulation results in use of less trusted source. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
- CVE-2026-100888High
Vulnerability in Trusted Domain Project OpenDKIM up to version 2.11.0 in the dkim_canon_selecthdrs function of libopendkim/dkim-canon.c in the DKIM Signature Header Selection component. Manipulation of the h argument leads to out-of-bounds write. Remote attack possible, exploit publicly available.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS