{"schema":"threatline.record/2","record":{"id":"CVE-2026-103010","aliases":[],"summary":"Heap-based Buffer Overflow in hMailServer","details":"Heap-based buffer overflow in the legacy Blowfish decryption routine (BlowFishEncryptor::DecryptFromString) in Progressive Robot hMailServer 6.0.0 through 6.3.3 on Windows allows a local interactive user with no hMailServer credentials to write bytes of their choosing past the end of a 255-byte heap buffer in the hMailServer service process, which runs as LocalSystem by default. The user does this by passing a long hexadecimal string to the COM method Utilities.BlowfishDecrypt, which checked no authentication. The routine converted hexadecimal input of any length into a fixed 255-byte buffer before decrypting it in place. The result is a denial of service (service crash), and possibly code execution with the privileges of the service account.","categories":["Unclassified"],"product":"hMailServer","vendor":"Progressive Robot Ltd","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103010","source_modified_at":"2026-10-08T14:22:28.966Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"hMailServer","vendor":"Progressive Robot Ltd","versions":[{"version":"6.0.0","status":"affected","lessThan":"6.3.4","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103010","source_modified_at":"2026-10-08T14:22:28.966Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"hMailServer","ecosystem":null},"version":"6.3.4","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00162,"percentile":0.051,"score_date":"2026-10-23"},"published_at":"2026-10-08T10:53:10.627Z","modified_at":"2026-10-08T14:22:28.966Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-103010","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-08T14:22:28.966Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103010","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://gitlab.com/hmailserver/hmailserver/-/commit/135a1908ff820ed587d5f180f98c53bd010d8931"},{"source":"CVE List","url":"https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.4"},{"source":"CVE List","url":"https://gitlab.com/hmailserver/hmailserver/-/work_items/49"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-08T14:22:18.436893Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-08T14:22:28.966Z","content_hash":"7a0ee5053c0cbc724bb91410b64e7b23c2d2a73cb1f0dc184dad7775a5e4c9eb"}}