CVE-2026-100888
HighCVSS 7.3Summary
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.
Risk Assessment
Out-of-bounds write may lead to memory corruption, potentially allowing an attacker to execute arbitrary code or cause a denial of service.
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-2026-100889High
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.
Original NVD description (English source)
A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation of the argument h can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS