CVE-2026-101281 Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authentication
Remote attackers can bypass authentication in OpenDMARC's SPF macro handler, potentially spoofing email domains.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101281?
CVE-2026-101281 is a medium-severity authentication bypass vulnerability in Trusted Domain Project OpenDMARC, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the recommended action to fix this issue.
Weakness: CWE-287
Which versions are affected by CVE-2026-101281?
How do I fix CVE-2026-101281?
No fix has been published for CVE-2026-101281 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-101281 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101281 exists.
Sources
Also known as DEBIAN-CVE-2026-101281, GHSA-fvpv-g9f4-87fc, UBUNTU-CVE-2026-101281.