---
id: CVE-2026-101016
title: A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2
summary: >-
  A vulnerability has been found in Trusted Domain Project OpenDMARC up to
  1.4.2. This affects the function opendmarc_policy_parse_dmarc in the library
  libopendmarc/opendmarc_policy.c. The manipulation of the argument
  fo/rf/ri/pct/sp/adkim…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-755
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: '2026-09-28T09:17:05.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101016'
references:
  - url: 'https://vuldb.com/cve/CVE-2026-101016'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/918242'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410886'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410886/cti'
    label: cna@vuldb.com
  - url: 'https://xuyongzhe-vt.github.io/share/opendmarc-bad-tag-drops-policy.html'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
ingestedAt: '2026-09-28T09:06:28.558Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-28T10:56:52.614606Z'
---

## Overview

A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_policy_parse_dmarc in the library libopendmarc/opendmarc_policy.c. The manipulation of the argument fo/rf/ri/pct/sp/adkim/aspf/rua/ruf leads to handling of exceptional conditions. Remote exploitation of the attack is possible. The exploit has been disclosed to the public 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.