OCTOBER 9, 2026
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Case File

CVE-2026-100891

HIGH · CVSS 7.3 EPSS 0.29% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-28 · Last synced 2026-10-09

CyberRota Analysis

AI-Generated

A vulnerability exists in the Internationalized Domain Name Handler of the Trusted Domain Project OpenDMARC up to version 1.4.2, specifically within the opendmarc_policy_query_dmarc function, which is susceptible to encoding errors. This flaw allows for remote exploitation, potentially compromising the integrity of email authentication processes. Organizations using affected versions should prioritize patching this vulnerability to mitigate the risk of exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-100891
Severity
HIGH
CVSS
7.3
EPSS
0.29%

Original NVD Description

A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. 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.