CVE-2026-56452: Apache MINA SSHD: Path traversal in SCP file reception

[Thomas Wolf <twolf () apache org>]

Severity: moderate 

Affected versions:

- Apache MINA SSHD (org.apache.sshd:sshd-scp) through 2.18.0
- Apache MINA SSHD (org.apache.sshd:sshd-scp) 3.0.0-M1 through 3.0.0-M4

Description:

Path traversal in the sshd-scp component of Apache MINA SSHD. Apache MINA SSHD is a Java library for client-side and 
server-side SSH.




The implementation of receiving files or directories via SCP did not validate filenames in SCP "C" or "D" commands. A 
malicious sender could send filenames containing paths, resulting in files to be written in attacker-controlled places.




The issue affects only

  *  applications that use no longer supported Apache MINA SSHD versions < 2.0.0 and use the SCP functions to receive 
files,
  *  or applications using sshd-scp in Apache MINA SSHD >= 2.0.0 to receive files.




Applications using Apache MINA SSHD >= 2.0.0 not using sshd-scp are not affected.




The issue is fixed in Apache MINA 2.19.0 and 3.0.0-M5. Affected applications are advised to upgrade to these versions.

Credit:

Unbbal (finder)

References:

https://mina.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-56452