CVE-2026-101280

Name	CVE-2026-101280
Description	A vulnerability was detected in Trusted Domain Project OpenDMARC up to 1.4.2. Affected is the function opendmarc_policy_query_dmarc of the component Multi-Record Set Handler. The manipulation results in authentication bypass by spoofing. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1149876

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
opendmarc (PTS)	bookworm	1.4.2-2	vulnerable
	trixie	1.4.2-5	vulnerable
	forky, sid	1.4.2-5.1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
opendmarc	source	(unstable)	(unfixed)			1149876

Notes

[trixie] - opendmarc <no-dsa> (Minor issue)
[bookworm] - opendmarc <postponed> (Minor issue)
https://xuyongzhe-vt.github.io/share/opendmarc-multi-record-downgrade.html