{"id":"CVE-2026-100891","revision":null,"records":[{"revision":"3f75fbca8acc44c3b6b04f9263372c04","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-100891","aliases":[],"title":"Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error","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.","state":0,"publishedAt":"2026-09-28T00:15:14.678+00:00","modifiedAt":"2026-10-01T13:55:15.001+00:00","affected":[{"ecosystem":"Vendor product","name":"OpenDMARC","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Trusted Domain Project\",\n                    \"product\": \"OpenDMARC\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"1.4.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"1.4.2\",\n                            \"status\": \"affected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"modules\": [\n                        \"Internationalized Domain Name Handler\"\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS: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","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C","score":7.3,"severity":"HIGH"},{"system":"CVSS 3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C","score":7.3,"severity":"HIGH"},{"system":"CVSS 2.0","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C","score":7.5,"severity":null}],"references":["https://vuldb.com/vuln/410841","https://vuldb.com/vuln/410841/cti","https://vuldb.com/cve/CVE-2026-100891","https://vuldb.com/submit/917215","https://weitongli.com/share/opendmarc-ulabel-not-converted.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-100891","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-100891","identifiers":["CVE-2026-100891"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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