---
id: CVE-2026-101281
title: A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2
summary: >-
  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 ma…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-287
vendor: Trusted Domain Project
product: OpenDMARC
affected:
  - OpenDMARC 1.4.0
  - OpenDMARC 1.4.1
  - OpenDMARC 1.4.2
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T01:16:44.367'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101281'
references:
  - url: >-
      https://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6
    label: cna@vuldb.com
  - url: 'https://github.com/trusteddomainproject/OpenDMARC/issues/262'
    label: cna@vuldb.com
  - url: 'https://github.com/trusteddomainproject/OpenDMARC/pull/328'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-101281'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/918284'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/411038'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/411038/cti'
    label: cna@vuldb.com
  - url: 'https://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.html'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T01:24:51.144Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.