CVE-2026-100891

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.

CVSS 4.0

5.5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS 3.1

7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-25)

CWE

CWE-172

Published

2026-09-28

Modified

2026-10-01

Record from

the NVD, synced 2026-10-19

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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