USN-8093-1: libssh vulnerability

Publication date

16 March 2026

Overview

libssh could be made to crash or behave unexpectedly.


Packages

  • libssh - A tiny C SSH library

Details

It was discovered that libssh incorrectly performed bounds checking when
processing SFTP extensions. If a client application queried extension data out
of bounds, it could cause the application to crash, resulting in a denial of
service, or exhibit unintended behavior.

It was discovered that libssh incorrectly performed bounds checking when
processing SFTP extensions. If a client application queried extension data out
of bounds, it could cause the application to crash, resulting in a denial of
service, or exhibit unintended behavior.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
25.10 questing libssh-4 –  0.11.2-1ubuntu0.3
24.04 LTS noble libssh-4 –  0.10.6-2ubuntu0.4
libssh-gcrypt-4 –  0.10.6-2ubuntu0.4
22.04 LTS jammy libssh-4 –  0.9.6-2ubuntu0.22.04.7
libssh-gcrypt-4 –  0.9.6-2ubuntu0.22.04.7
20.04 LTS focal libssh-4 –  0.9.3-2ubuntu2.5+esm4  
libssh-gcrypt-4 –  0.9.3-2ubuntu2.5+esm4  
18.04 LTS bionic libssh-4 –  0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7  
libssh-gcrypt-4 –  0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7  
16.04 LTS xenial libssh-4 –  0.6.3-4.3ubuntu0.6+esm5  
libssh-gcrypt-4 –  0.6.3-4.3ubuntu0.6+esm5  

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