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Vulnerability · Published Sep 29, 2026 · Assigned by VulDB

CVE-2026-101278Trusted Domain Project OpenDMARC PSL Wildcard opendmarc_tld.c : opendmarc_get_tld origin validation

Medium 4.3

In plain English

A medium-severity insufficient verification of data authenticity in OpenDMARC from Trusted Domain Project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.1%top 97.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A weakness has been identified in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_get_tld of the file libopendmarc/opendmarc_tld.c : of the component PSL Wildcard Handler. Executing a manipulation can lead to origin validation error. The attack may be launched 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12opendmarcno fix listedDEBIAN-CVE-2026-101278
Debian:13opendmarcno fix listedDEBIAN-CVE-2026-101278
Debian:14opendmarcno fix listedDEBIAN-CVE-2026-101278
Ubuntu:22.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101278
Ubuntu:24.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101278
Ubuntu:26.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101278
Ubuntu:26.10opendmarcno fix listedUBUNTU-CVE-2026-101278

Affected products (as reported)

VendorProductVersions
Trusted Domain Project OpenDMARC 1.4.01.4.11.4.2

Weakness: CWE-346, CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

References