All vulnerabilities
CVE-2026-100888

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

Trusted Domain Project OpenDKIM
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 30 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.29%Chance of exploitation activity in the next 30 days, higher than 20% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published27 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

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.

Text from CVE List

Affected versions 12

  • OpenDKIMaffected: 2.0CVE List
  • OpenDKIMaffected: 2.1CVE List
  • OpenDKIMaffected: 2.2CVE List
  • OpenDKIMaffected: 2.3CVE List
  • OpenDKIMaffected: 2.4CVE List
  • OpenDKIMaffected: 2.5CVE List
  • OpenDKIMaffected: 2.6CVE List
  • OpenDKIMaffected: 2.7CVE List
  • OpenDKIMaffected: 2.8CVE List
  • OpenDKIMaffected: 2.9CVE List
  • OpenDKIMaffected: 2.10CVE List
  • OpenDKIMaffected: 2.11.0CVE List

References 5