What’s Vulnerable › Vulnerabilities

CVE-2026-100888: Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-30
• Weakness: CWE-119

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.

Affected products

• Trusted Domain Project OpenDKIM: 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 (+6)

References

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

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