---
id: CVE-2026-101015
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 issue is some unknown functionality of the file policy.c of
  the component Domain Handler. Executing a manipulation can lead to improper
  validation of…
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-20
  - CWE-1289
vendor: Trusted Domain Project
product: OpenDMARC
affected:
  - OpenDMARC 1.4.0
  - OpenDMARC 1.4.1
  - OpenDMARC 1.4.2
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T09:17:05.180'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101015'
references:
  - url: 'https://vuldb.com/cve/CVE-2026-101015'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/917216'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410885'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410885/cti'
    label: cna@vuldb.com
  - url: 'https://weitongli.com/share/opendmarc-unicode-dot-bypass.html'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T09:06:28.561Z'
---

## Overview

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is some unknown functionality of the file policy.c of the component Domain Handler. Executing a manipulation can lead to improper validation of unsafe equivalence in input. The attack may be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## Remediation

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