CVE-2026-100891 Trusted Domain Project OpenDMARC - Encoding Error

Trusted Domain Project OpenDMARC <= 1.4.2 contains an encoding error caused by manipulation in opendmarc_policy_query_dmarc function in Internationalized Domain Name Handler, letting remote attackers cause encoding errors, exploit requires crafted input.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.29% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Encoding Error
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-172

Vendor fix

Update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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