CVE-2026-100888Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write
Updated under an hour ago ()
Does this affect you?
It affects Trusted Domain Project OpenDKIM. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.29%, higher than 20% of scored CVEs.
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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.
- CVSS
- 7.3 HIGH (v3.1, CNA)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
- Weakness (CWE)
- CWE-787, CWE-119
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.29% (percentile 20)
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Trusted Domain Project OpenDKIM trusted_domain_project:opendkim | 2.0; 2.1; 2.2; 2.3; 2.4; 2.5; 2.6; 2.7; and 4 more ranges | CNA record |
References
- https://vuldb.com/vuln/410837vdb-entry, technical-description
- https://vuldb.com/vuln/410837/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-100888third-party-advisory
- https://vuldb.com/submit/917015third-party-advisory
- https://weitongli.com/share/opendkim-h-tag-oob-write.htmlexploit
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.