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Vulnerability · Published Sep 29, 2026 · Assigned by VulDB

CVE-2026-101281Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authentication

High 7.3

In plain English

A high-severity improper authentication 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 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.4%top 64.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12opendmarcno fix listedDEBIAN-CVE-2026-101281
Debian:13opendmarcno fix listedDEBIAN-CVE-2026-101281
Debian:14opendmarcno fix listedDEBIAN-CVE-2026-101281
Ubuntu:22.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101281
Ubuntu:24.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101281
Ubuntu:26.04:LTSopendmarcno fix listedUBUNTU-CVE-2026-101281
Ubuntu:26.10opendmarcno fix listedUBUNTU-CVE-2026-101281

Affected products (as reported)

VendorProductVersions
Trusted Domain Project OpenDMARC 1.4.01.4.11.4.2

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

References