CVE-2026-101278 Trusted Domain Project OpenDMARC PSL Wildcard opendmarc_tld.c : opendmarc_get_tld origin validation
Remote attackers can bypass origin validation in OpenDMARC's PSL wildcard handler, potentially spoofing email domains.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101278?
CVE-2026-101278 is a medium-severity vulnerability in Trusted Domain Project OpenDMARC, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-101278?
How do I fix CVE-2026-101278?
No fix has been published for CVE-2026-101278 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-101278 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101278 exists.
Sources
Also known as DEBIAN-CVE-2026-101278, GHSA-f9p6-hxqg-x7r4, UBUNTU-CVE-2026-101278.