What’s Vulnerable › Vulnerabilities

CVE-2026-100891: Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-10-01
• Weakness: CWE-172

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.

Affected products

• Trusted Domain Project OpenDMARC: 1.4.0, 1.4.1, 1.4.2

References

• https://vuldb.com/cve/CVE-2026-100891
• https://vuldb.com/submit/917215
• https://vuldb.com/vuln/410841
• https://vuldb.com/vuln/410841/cti
• https://weitongli.com/share/opendmarc-ulabel-not-converted.html

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