{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103010", "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a", "state": "PUBLISHED", "assignerShortName": "GitLab", "dateReserved": "2026-09-29T21:04:45.349Z", "datePublished": "2026-10-08T10:53:10.627Z", "dateUpdated": "2026-10-08T10:53:10.627Z"}, "containers": {"cna": {"title": "Heap-based Buffer Overflow in hMailServer", "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"vendor": "Progressive Robot Ltd", "product": "hMailServer", "repo": "https://gitlab.com/hmailserver/hmailserver", "versions": [{"version": "6.0.0", "status": "affected", "lessThan": "6.3.4", "versionType": "semver"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-122: Heap-based Buffer Overflow", "cweId": "CWE-122", "type": "CWE"}]}], "references": [{"url": "https://gitlab.com/hmailserver/hmailserver/-/commit/135a1908ff820ed587d5f180f98c53bd010d8931"}, {"url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.4"}, {"url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/49"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "solutions": [{"lang": "en", "value": "Upgrade to hMailServer 6.3.6, which also requires authentication for the COM Utilities helpers (6.3.4 is the first release with this routine fixed)."}], "credits": [{"lang": "en", "value": "Found in the hMailServer project's own code review (Progressive Robot Ltd)", "type": "finder"}], "providerMetadata": {"orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a", "shortName": "GitLab", "dateUpdated": "2026-10-08T10:53:10.627Z"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "hMailServer", "repo": "https://gitlab.com/hmailserver/hmailserver", "vendor": "Progressive Robot Ltd", "versions": [{"lessThan": "6.3.4", "status": "affected", "version": "6.0.0", "versionType": "semver"}]}], "source": "cve@gitlab.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-103010", "lastModified": "2026-10-08T11:16:42.117", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "cve@gitlab.com", "type": "Secondary"}]}, "published": "2026-10-08T11:16:42.117", "references": [{"source": "cve@gitlab.com", "url": "https://gitlab.com/hmailserver/hmailserver/-/commit/135a1908ff820ed587d5f180f98c53bd010d8931"}, {"source": "cve@gitlab.com", "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.4"}, {"source": "cve@gitlab.com", "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/49"}], "sourceIdentifier": "cve@gitlab.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "cve@gitlab.com", "type": "Primary"}]}

{}

{"created": "2026-10-08T12:30:04.562906+00:00", "updated": "2026-10-08T12:30:04.562912+00:00", "vendors": []}