{"id":"CVE-2026-94029","title":"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. Apache MINA SSHD is a Java library for client-side and server-si…","summary":"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. Apache MINA SSHD is a Java library for client-side and server-si…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"Apache Software Foundation","product":"org.apache.sshd:sshd-sftp","affected":["org.apache.sshd:sshd-sftp >= 1.0.0 < 2.20.0","org.apache.sshd:sshd-sftp >= 3.0.0-M1 < 3.0.0-M6"],"published":"2026-09-30","updated":"2026-09-30","sourceUpdated":"2026-09-30T20:17:37.383","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-94029","references":[{"url":"https://lists.apache.org/thread.html/ytbl4rwby62xl7llm3wp7k975wwdx99t","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/29/37","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94029.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-94029"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543853"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-94029"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94029"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T19:42:43.742304Z"},"epss":0.00321,"epssPercentile":0.2493,"ingestedAt":"2026-09-30T10:01:20.473Z","slug":"CVE-2026-94029","body":"## Overview\n\nServer-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. Apache 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 (possibly sparse) file 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apicurio Registry 3, Red Hat Fuse 7 · no fix planned: Red Hat build of Apicurio Registry 3, Red Hat Fuse 7, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4 · updated 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94029.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}