---
id: CVE-2026-100890
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_spf_ipv6_explode in
  the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This
  manipulation o…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-404
  - CWE-476
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: '2026-09-28T01:16:28.047'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100890'
references:
  - url: 'https://vuldb.com/cve/CVE-2026-100890'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/917188'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410840'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410840/cti'
    label: cna@vuldb.com
  - url: 'https://weitongli.com/share/opendmarc-ip6-wild-pointer.html'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T01:00:36.647Z'
---

## Overview

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp causes null pointer dereference. It is possible to initiate the attack 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.