{"id":"CVE-2026-107577","revision":null,"records":[{"revision":"c96cf3fb2c714afca1b97a75b1fb13b3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107577","aliases":[],"title":"Loop with Unreachable Exit Condition ('Infinite Loop') in hMailServer","description":"Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote unauthenticated attacker to make the mail services unavailable by sending a message. Removing a MIME header parameter whose value is empty and directly followed by a semicolon (for example a Content-Disposition with 'filename=a.bat; filename=;') entered a loop that never terminates, holding a worker thread at full load until the server is restarted; this is reached when the attachment blocker renames a blocked attachment or a filename is set over the REST API. Separately, decoding a header field that holds many RFC 2047 encoded words of an encoding other than base64 or quoted-printable, removing a parameter with many RFC 2231 continuations, and deleting many header fields of one name each took time growing with the square of the message, on the small thread pools that serve IMAP, SMTP and POP3 connections, delivery and the REST API.","state":0,"publishedAt":"2026-10-08T11:46:51.086+00:00","modifiedAt":"2026-10-08T14:17:33.868+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:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://gitlab.com/hmailserver/hmailserver/-/work_items/72","https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107577","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107577","identifiers":["CVE-2026-107577"]},"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-a5bcdf6ab6d94076983501bc0e56dd96","complete":false,"records":13754,"lastAttemptAt":"2026-11-11T08:39:48.5063796+00:00","lastSuccessAt":"2026-11-11T08:39:48.502+00:00","error":"16 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-11T08:39:48.502+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13770,"expectedIdentifiers":13808,"failedIdentifiers":16},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T08:27:47.0671487+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T08:27:47.0671487+00:00","lastSuccessAt":"2026-11-11T08:27:47.3858436+00:00","error":null,"lastVerifiedAt":"2026-11-11T08:27:47.3858438+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-4463bca2214348638313ac7302b155ec","complete":true,"records":13748,"lastAttemptAt":"2026-11-11T08:27:47.8884887+00:00","lastSuccessAt":"2026-11-11T07:26:17.628+00:00","error":null,"lastVerifiedAt":"2026-11-11T07:26:17.628+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13808,"expectedIdentifiers":13808,"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-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T08:27:46.9180255+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T08:27:46.9180255+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+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-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T08:25:46.0590741+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T08:25:46.0590741+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+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-0e3796c351bac632fda8fc3b3641da2bc6f0237cd79e78b1e59d17ce0aa22d32","complete":true,"records":3081,"lastAttemptAt":"2026-11-11T08:27:47.0269454+00:00","lastSuccessAt":"2026-11-10T20:24:10.5326555+00:00","error":null,"lastVerifiedAt":"2026-11-11T08:27:47.0269454+00:00","snapshotPublishedAt":"2026-11-10T20:03:04+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-085e065fc9050ae18408f7e722c39653aeb186872334d7b3ec1fcafb7ed43d25","complete":true,"records":231665,"lastAttemptAt":"2026-11-11T08:27:46.7420627+00:00","lastSuccessAt":"2026-11-11T08:27:45.2700102+00:00","error":null,"lastVerifiedAt":"2026-11-11T08:27:46.7420627+00:00","snapshotPublishedAt":"2026-11-11T07:32:59+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}