{"id":"CVE-2026-107584","revision":null,"records":[{"revision":"e65c7c7288364e7182d1ea068cfd13e4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107584","aliases":[],"title":"Not Failing Securely ('Failing Open') in hMailServer","description":"Progressive Robot hMailServer 6.0.0 through 6.3.5 fails open when applying DANE (RFC 7672) to outbound SMTP delivery. The server's validating DNSSEC resolver treated a TLSA or MX lookup that did not complete (no answer, SERVFAIL, a malformed reply), an answer without the requested records and without an NSEC/NSEC3 proof of their absence, and an answer whose records carried no applicable RRSIG as if the recipient domain were unsigned, and from 6.2.19 it also delivered to mail exchangers taken from an unvalidated MX lookup that the DNSSEC-validated MX record set did not name. An attacker who can drop, forge or strip DNS answers on the path to the server's resolver, at the resolver, or between the resolver and the recipient domain's name servers, and who holds an active position on the SMTP path, can thereby disable DANE for a DNSSEC-signed recipient domain and cause messages to be delivered in cleartext or to a host of the attacker's choosing with an arbitrary certificate, where they can be read and modified.","state":0,"publishedAt":"2026-10-08T11:49:16.083+00:00","modifiedAt":"2026-10-08T17:34:40.561+00:00","affected":[{"ecosystem":"Vendor product","name":"hMailServer","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Progressive Robot Ltd\",\n                    \"product\": \"hMailServer\",\n                    \"repo\": \"https://gitlab.com/hmailserver/hmailserver\",\n                    \"versions\": [\n                        {\n                            \"version\": \"6.0.0\",\n                            \"status\": \"affected\",\n                            \"lessThan\": \"6.3.6\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4,"severity":"HIGH"}],"references":["https://gitlab.com/hmailserver/hmailserver/-/work_items/64","https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107584","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107584","identifiers":["CVE-2026-107584"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-d0c54bf27dd44f59b652d410e8e55def","complete":true,"records":13704,"lastAttemptAt":"2026-11-10T17:24:58.2594049+00:00","lastSuccessAt":"2026-11-10T16:26:03.716+00:00","error":null,"lastVerifiedAt":"2026-11-10T16:26:03.716+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13758,"expectedIdentifiers":13758,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-10T17:24:49.2932543+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-10T17:24:49.2932543+00:00","lastSuccessAt":"2026-11-10T17:24:49.459896+00:00","error":null,"lastVerifiedAt":"2026-11-10T17:24:49.4598962+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-059a952fa5b34452ba3a4ff42f04741b","complete":true,"records":13710,"lastAttemptAt":"2026-11-10T17:24:57.2351467+00:00","lastSuccessAt":"2026-11-10T17:24:57.231+00:00","error":null,"lastVerifiedAt":"2026-11-10T17:24:57.231+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13758,"expectedIdentifiers":13758,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-50a085e5b7a5d1546eabdb7e52fab85d658afa8554d3cf95a0891c49d83f2979","complete":true,"records":9935,"lastAttemptAt":"2026-11-10T17:24:49.1476899+00:00","lastSuccessAt":"2026-11-10T16:25:20.0114252+00:00","error":null,"lastVerifiedAt":"2026-11-10T17:24:49.1476899+00:00","snapshotPublishedAt":"2026-11-10T16:18:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-26503967ae4379db8f374089589d6e03fb15bd31f820c9e992aaf93840c2236c","complete":true,"records":1971,"lastAttemptAt":"2026-11-10T17:21:30.7782647+00:00","lastSuccessAt":"2026-11-09T21:02:20.472473+00:00","error":null,"lastVerifiedAt":"2026-11-10T17:21:30.7782647+00:00","snapshotPublishedAt":"2026-11-09T20:18:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-df497239f2f75af38e095cb498791dad4044a8a9a7f5f0ee6008bb732579ab9d","complete":true,"records":3081,"lastAttemptAt":"2026-11-10T17:24:49.2499106+00:00","lastSuccessAt":"2026-11-10T14:21:34.3717399+00:00","error":null,"lastVerifiedAt":"2026-11-10T17:24:49.2499106+00:00","snapshotPublishedAt":"2026-11-10T14:18:07+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-82794ed9d128b3d2f332e24d4ecbf30e5b7d49fb88ff3791fdf7516fda05c8c9","complete":true,"records":231614,"lastAttemptAt":"2026-11-10T17:24:49.0209485+00:00","lastSuccessAt":"2026-11-10T17:24:47.5089691+00:00","error":null,"lastVerifiedAt":"2026-11-10T17:24:49.0209485+00:00","snapshotPublishedAt":"2026-11-10T16:33:23+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}