{"schema_version": "1.6.1", "id": "CVE-2026-94029", "summary": "Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension", "details": "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-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.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "1.0.0"}, {"fixed": "2.20.0"}]}, {"type": "SEMVER", "events": [{"introduced": "3.0.0-M1"}, {"fixed": "3.0.0-M6"}]}]}], "references": [{"type": "WEB", "url": "https://lists.apache.org/thread.html/ytbl4rwby62xl7llm3wp7k975wwdx99t"}]}