Trusted Domain Project OpenDKIM up to 2.11.0 DKIM Signature Header Selection libopendkim/dkim-canon.c dkim_canon_selecthdrs h out-of-bounds write

Summaryinfo

A vulnerability was found in Trusted Domain Project OpenDKIM up to 2.11.0. It has been rated as critical. This impacts the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. The manipulation of the argument h leads to out-of-bounds write. This vulnerability is uniquely identified as CVE-2026-100888. The attack is possible to be carried out remotely. Moreover, an exploit is present. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in Trusted Domain Project OpenDKIM up to 2.11.0 and classified as critical. This issue affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. The manipulation of the argument h with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability.

The advisory is shared at weitongli.com. The identification of this vulnerability is CVE-2026-100888. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

The exploit is available at weitongli.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Project Management Software

Vendor

• Trusted Domain Project

Name

• OpenDKIM

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #917015: The Trusted Domain Project OpenDKIM 2.11.0 Out-of-bounds Write (by WeitongLi)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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