{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93994", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-09-19T12:21:52.758Z", "datePublished": "2026-09-30T09:45:32.561Z", "dateUpdated": "2026-09-30T10:14:09.612Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-09-30T09:45:32.561Z"}, "title": "Apache MINA SSHD: Repeated-publickey policy bypass on server", "problemTypes": [{"descriptions": [{"description": "CWE-304 Missing critical step in authentication", "lang": "en", "cweId": "CWE-304", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache MINA SSHD", "packageURL": "pkg:maven/org.apache.sshd/sshd-core", "versions": [{"status": "affected", "version": "0", "lessThan": "2.20.0", "versionType": "maven"}, {"status": "affected", "version": "3.0.0-M1", "lessThan": "3.0.0-M6", "versionType": "maven"}], "defaultStatus": "unaffected", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "org.apache.sshd:sshd-core"}], "descriptions": [{"value": "Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods \"publickey,publickey\". Apache MINA SSHD provides an equivalent configuration mechanism.\n\n\n\n\nIn Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass.\n\n\n\n\n\n\nUsers are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div><div>Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods \"publickey,publickey\". Apache MINA SSHD provides an equivalent configuration mechanism.</div><div><br></div><div>In Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass.</div><div><br></div></div>Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue."}]}], "references": [{"url": "https://lists.apache.org/thread.html/9t3vsm8rnvwdv9779mlg1lq2fbwojdwp", "tags": ["vendor-advisory"]}], "metrics": [{"scenarios": [{"lang": "en", "value": "GENERAL"}], "format": "CVSS", "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseSeverity": "HIGH", "baseScore": 8.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}}, {"other": {"type": "Textual description of severity", "content": {"text": "important"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Abhishek Kushwaha", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/09/29/33"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-30T10:14:09.612Z"}}]}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.sshd:sshd-core", "packageURL": "pkg:maven/org.apache.sshd/sshd-core", "product": "Apache MINA SSHD", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "2.20.0", "status": "affected", "version": "0", "versionType": "maven"}, {"lessThan": "3.0.0-M6", "status": "affected", "version": "3.0.0-M1", "versionType": "maven"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Apache MINA SSHD is a Java library for client-side and server-side SSH. SSH servers can be configured to require multi-authentication schemes, for instance two different public keys, not just one. In OpenSSH, this would be done by setting in sshd_config AuthenticationMethods \"publickey,publickey\". Apache MINA SSHD provides an equivalent configuration mechanism.\n\n\n\n\nIn Apache MINA SSHD versions up to 2.19.0 and 3.0.0-M1 to 3.0.0-M5 the server code in component sshd-core does not enforce that the two public keys presented are different. A user can thus successfully authenticate with only one of the two key pairs required by presenting this single key twice. This is a partial authentication bypass.\n\n\n\n\n\n\nUsers are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue."}], "id": "CVE-2026-93994", "lastModified": "2026-09-30T11:16:47.577", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "security@apache.org", "type": "Secondary"}]}, "published": "2026-09-30T10:17:17.460", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/9t3vsm8rnvwdv9779mlg1lq2fbwojdwp"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/09/29/33"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-304"}], "source": "security@apache.org", "type": "Secondary"}]}

{}

{}