CVE-2026-94029 — Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension

Description (CNA)

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. 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 (possibly sparse) file exhaust the server-side memory, taking down the server. 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.

Affected (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache MINA SSHD	affected 1.0.0 before 2.20.0; affected 3.0.0-M1 before 3.0.0-M6

CWE

CWE-770

References

https://lists.apache.org/thread.html/ytbl4rwby62xl7llm3wp7k975wwdx99t

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/09/29/37

CISA-ADP

No English description supplied.

No references supplied.