{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40194", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-09T20:59:17.620Z", "datePublished": "2026-04-10T20:24:06.696Z", "dateUpdated": "2026-04-10T20:24:06.696Z"}, "containers": {"cna": {"title": "phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using != instead of hash_equals()", "problemTypes": [{"descriptions": [{"cweId": "CWE-208", "lang": "en", "description": "CWE-208: Observable Timing Discrepancy", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx"}, {"name": "https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac", "tags": ["x_refsource_MISC"], "url": "https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac"}, {"name": "https://github.com/phpseclib/phpseclib/releases/tag/1.0.28", "tags": ["x_refsource_MISC"], "url": "https://github.com/phpseclib/phpseclib/releases/tag/1.0.28"}, {"name": "https://github.com/phpseclib/phpseclib/releases/tag/2.0.53", "tags": ["x_refsource_MISC"], "url": "https://github.com/phpseclib/phpseclib/releases/tag/2.0.53"}, {"name": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.51", "tags": ["x_refsource_MISC"], "url": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.51"}], "affected": [{"vendor": "phpseclib", "product": "phpseclib", "versions": [{"version": "< 1.0.28", "status": "affected"}, {"version": ">= 2.0.0, < 2.0.53", "status": "affected"}, {"version": ">= 3.0.0, < 3.0.51", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-10T20:24:06.696Z"}, "descriptions": [{"lang": "en", "value": "phpseclib is a PHP secure communications library. Prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\\Net\\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28."}], "source": {"advisory": "GHSA-r854-jrxh-36qx", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "phpseclib is a PHP secure communications library. Prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\\Net\\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28."}], "id": "CVE-2026-40194", "lastModified": "2026-04-10T21:16:27.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-10T21:16:27.583", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac"}, {"source": "security-advisories@github.com", "url": "https://github.com/phpseclib/phpseclib/releases/tag/1.0.28"}, {"source": "security-advisories@github.com", "url": "https://github.com/phpseclib/phpseclib/releases/tag/2.0.53"}, {"source": "security-advisories@github.com", "url": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.51"}, {"source": "security-advisories@github.com", "url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-208"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}