CVE-2026-101277
MediumCVSS 6.5Summary
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.
Risk Assessment
The risk is the possibility of remote exploitation to compromise DKIM signature integrity, which could lead to email spoofing and phishing attacks.
Recommendation
It is recommended to immediately update OpenDKIM to the latest available version if available, and monitor public information for patches. If no patch is available, restrict access to the service and implement additional security measures.
Other vulnerabilities in OpenDKIM
See all- 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.
- 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 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS