{"id":"CVE-2026-100888","state":"PUBLISHED","title":"Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write","description":"A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation of the argument h can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.","publishedAt":"2026-09-27T23:30:16.015Z","updatedAt":"2026-09-30T22:16:22.497Z","severity":{"score":6.9,"label":"Medium","version":"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","source":"VulDB"},"assigner":"VulDB","products":["Trusted Domain Project OpenDKIM"],"affected":[{"vendor":"Trusted Domain Project","product":"OpenDKIM","versions":[{"version":"2.0","status":"affected"},{"version":"2.1","status":"affected"},{"version":"2.2","status":"affected"},{"version":"2.3","status":"affected"},{"version":"2.4","status":"affected"},{"version":"2.5","status":"affected"},{"version":"2.6","status":"affected"},{"version":"2.7","status":"affected"},{"version":"2.8","status":"affected"},{"version":"2.9","status":"affected"},{"version":"2.10","status":"affected"},{"version":"2.11.0","status":"affected"}],"cpes":["cpe:2.3:a:trusted_domain_project:opendkim:*:*:*:*:*:*:*:*"],"modules":["DKIM Signature Header Selection"]}],"references":["https://vuldb.com/vuln/410837","https://vuldb.com/vuln/410837/cti","https://vuldb.com/cve/CVE-2026-100888","https://vuldb.com/submit/917015","https://weitongli.com/share/opendkim-h-tag-oob-write.html"],"weaknesses":["CWE-787","CWE-119"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/100xxx/CVE-2026-100888.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100888","state":"PUBLISHED","datePublished":"2026-09-27T23:30:16.015Z","dateUpdated":"2026-09-30T22:16:22.497Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-09-27T07:35:52.389Z"},"containers":{"cna":{"title":"Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write","descriptions":[{"lang":"en","value":"A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. 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The vendor was contacted early about this disclosure but did not respond in any way."}],"affected":[{"vendor":"Trusted Domain Project","product":"OpenDKIM","versions":[{"version":"2.0","status":"affected"},{"version":"2.1","status":"affected"},{"version":"2.2","status":"affected"},{"version":"2.3","status":"affected"},{"version":"2.4","status":"affected"},{"version":"2.5","status":"affected"},{"version":"2.6","status":"affected"},{"version":"2.7","status":"affected"},{"version":"2.8","status":"affected"},{"version":"2.9","status":"affected"},{"version":"2.10","status":"affected"},{"version":"2.11.0","status":"affected"}],"cpes":["cpe:2.3:a:trusted_domain_project:opendkim:*:*:*:*:*:*:*:*"],"modules":["DKIM Signature Header Selection"]}],"references":[{"url":"https://vuldb.com/vuln/410837","name":"VDB-410837 | Trusted Domain Project OpenDKIM DKIM Signature Header Selection dkim-canon.c dkim_canon_selecthdrs out-of-bounds write","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/vuln/410837/cti","name":"VDB-410837 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-100888","name":"CVE-2026-100888 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/917015","name":"Submit #917015 | The Trusted Domain Project OpenDKIM 2.11.0 Out-of-bounds Write","tags":["third-party-advisory"]},{"url":"https://weitongli.com/share/opendkim-h-tag-oob-write.html","tags":["exploit"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":6.9,"vectorString":"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","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":7.3,"vectorString":"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","baseSeverity":"HIGH"}},{"cvssV3_0":{"version":"3.0","baseScore":7.3,"vectorString":"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","baseSeverity":"HIGH"}},{"cvssV2_0":{"version":"2.0","baseScore":7.5,"vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","type":"CWE","lang":"en","description":"Out-of-bounds Write"}]},{"descriptions":[{"cweId":"CWE-119","type":"CWE","lang":"en","description":"Memory Corruption"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-09-27T23:30:16.015Z"},"timeline":[{"time":"2026-09-27T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-09-27T02:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-09-27T09:41:01.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"WeitongLi (VulDB User)","type":"reporter"},{"lang":"en","value":"VulDB CNA Team","type":"coordinator"}],"x_generator":["VulDB PVTS v202609"]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-30T22:16:08.537046Z","id":"CVE-2026-100888","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-30T22:16:22.497Z"}}]}}}