CVE-2026-93996: Apache MINA SSHD: Memory exhaustion DoS via unbounded SCP command line read

[Thomas Wolf <twolf () apache org>]

Severity: moderate 
    CVSS 3.1: 6.5 (medium) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions:

- Apache MINA SSHD before 2.20.0
- Apache MINA SSHD 3.0.0-M1 before 3.0.0-M6

Description:

Uncontrolled resource consumption in component ssd-scp in Apache MINA SSHD versions up to 2.19.0 or 3.0.0-M1 to 
3.0.0-M5. Apache MINA SSHD is a Java library for client-side and server-side SSH.




Component sshd-scp of Apache MINA SSHD provides a Java implementation of SCP. The SCP command protocol is line-oriented 
with LF-terminated lines. The protocol handler in sshd-scp did not impose any limit on the length of such protocol 
lines. A malicious peer just sending a junk command containing a never-ending sequence of characters but never a LF 
would cause the receiver to allocate memory to store this whole junk command, exhausting memory and crashing the 
application with an OutOfMemoryError.




Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by enforcing an upper limit on the 
length of SCP protocol lines.

Credit:

Ho1aAs <xxy010605 () gmail com> (finder)

References:

https://mina.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-93996