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[USN-8093-2] libssh vulnerability

Posted on 19 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8093-2
August 19, 2026

libssh vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

libssh could be made to crash or behave unexpectedly.

Software Description:
- libssh: A tiny C SSH library

Details:

USN-8093-1 fixed a vulnerability in libssh. This update provides
the corresponsing fix for Ubuntu 26.04 LTS.

Original advisory 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.

Update instructions:

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

Ubuntu 26.04 LTS
libssh-4 0.11.3-1ubuntu2

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

References:
https://ubuntu.com/security/notices/USN-8093-2
https://ubuntu.com/security/notices/USN-8093-1
CVE-2026-3731

Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.11.3-1ubuntu2

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