{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-94029", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-09-19T17:17:00.525Z", "datePublished": "2026-09-30T09:35:51.711Z", "dateUpdated": "2026-09-30T10:14:18.127Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-09-30T09:35:51.711Z"}, "title": "Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension", "problemTypes": [{"descriptions": [{"description": "CWE-770 Allocation of resources without limits or throttling", "lang": "en", "cweId": "CWE-770", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache MINA SSHD", "packageURL": "pkg:maven/org.apache.sshd/sshd-sftp", "versions": [{"status": "affected", "version": "1.0.0", "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-sftp"}], "descriptions": [{"value": "Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension.\u00a0Apache MINA SSHD is a Java library for client-side and server-side SSH.\n\n\n\n\nUsing a very small \"block size\" (for instance 256, which is the minimum) on a huge file generates many (file size / block size) hashes. The resulting SFTP reply message was accumulated fully in memory server-side, which could, with a suitably large\u00a0(possibly sparse)\u00a0file exhaust the server-side memory, taking down the server.\n\n\n\n\nUsers are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by imposing a maximum limit on the size of the reply. Many SFTP implementations have a general limit on the size of SFTP messages anyway; typically 256kB as in OpenSSH or also in Apache MINA SSHD.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension.&nbsp;Apache MINA SSHD is a Java library for client-side and server-side SSH.</div><div><br></div><div>Using a very small \"block size\" (for instance 256, which is the minimum) on a huge file generates many (file size / block size) hashes. The resulting SFTP reply message was accumulated fully in memory server-side, which could, with a suitably large&nbsp;(possibly sparse)&nbsp;file exhaust the server-side memory, taking down the server.</div><div><br></div>Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by imposing a maximum limit on the size of the reply. Many SFTP implementations have a general limit on the size of SFTP messages anyway; typically 256kB as in OpenSSH or also in Apache MINA SSHD."}]}], "references": [{"url": "https://lists.apache.org/thread.html/ytbl4rwby62xl7llm3wp7k975wwdx99t", "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": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}}, {"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Ho1aAs <xxy010605@gmail.com>", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/09/29/37"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-30T10:14:18.127Z"}}]}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.sshd:sshd-sftp", "packageURL": "pkg:maven/org.apache.sshd/sshd-sftp", "product": "Apache MINA SSHD", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "2.20.0", "status": "affected", "version": "1.0.0", "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": "Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension.\u00a0Apache MINA SSHD is a Java library for client-side and server-side SSH.\n\n\n\n\nUsing a very small \"block size\" (for instance 256, which is the minimum) on a huge file generates many (file size / block size) hashes. The resulting SFTP reply message was accumulated fully in memory server-side, which could, with a suitably large\u00a0(possibly sparse)\u00a0file exhaust the server-side memory, taking down the server.\n\n\n\n\nUsers are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by imposing a maximum limit on the size of the reply. Many SFTP implementations have a general limit on the size of SFTP messages anyway; typically 256kB as in OpenSSH or also in Apache MINA SSHD."}], "id": "CVE-2026-94029", "lastModified": "2026-09-30T11:16:47.920", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security@apache.org", "type": "Secondary"}]}, "published": "2026-09-30T10:17:18.010", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/ytbl4rwby62xl7llm3wp7k975wwdx99t"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/09/29/37"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security@apache.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0,2.20.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0-M1,3.0.0-M6)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache MINA SSHD", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "mina_sshd", "vendor": "apache"}], "created": "2026-09-30T10:30:17.146760+00:00", "updated": "2026-09-30T11:30:18.246458+00:00", "vendors": ["apache", "apache$PRODUCT$mina_sshd"]}