CVE-2026-100888

NameCVE-2026-100888
DescriptionA 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.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
opendkim (PTS)bookworm2.11.0~beta2-8+deb12u1vulnerable
trixie2.11.0~beta2-9.1vulnerable
forky, sid2.11.0~beta2-9.2vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opendkimsource(unstable)(unfixed)

Notes

https://weitongli.com/share/opendkim-h-tag-oob-write.html
check upstream details

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