CVE-2026-100888

HIGH 7.3

Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-787 CWE-119
Vendor	trusted domain project
Product	opendkim
Published	Sep 27, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Trusted Domain Project / OpenDKIM

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

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/410837 vuldb.com: https://vuldb.com/vuln/410837/cti vuldb.com: https://vuldb.com/cve/CVE-2026-100888 vuldb.com: https://vuldb.com/submit/917015 weitongli.com: https://weitongli.com/share/opendkim-h-tag-oob-write.html

Credits

🔍 WeitongLi (VulDB User) VulDB CNA Team