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[USN-8309-1] libssh2 vulnerability

Posted on 26 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8309-1
May 26, 2026

libssh2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS

Summary:

libssh2 could be made to crash if it received specially crafted
network traffic.

Software Description:
- libssh2: Client-side C library implementing the SSH2 protocol

Details:

It was discovered that libssh2 incorrectly handled username and password
length values during SSH password authentication. A remote attacker could
possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 26.04 LTS
libssh2-1t64 1.11.1-1ubuntu0.26.04.1

Ubuntu 25.10
libssh2-1t64 1.11.1-1ubuntu0.25.10.1

Ubuntu 24.04 LTS
libssh2-1t64 1.11.0-4.1ubuntu0.24.04.1

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

References:
https://ubuntu.com/security/notices/USN-8309-1
CVE-2026-7598

Package Information:
https://launchpad.net/ubuntu/+source/libssh2/1.11.1-1ubuntu0.26.04.1
https://launchpad.net/ubuntu/+source/libssh2/1.11.1-1ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/libssh2/1.11.0-4.1ubuntu0.24.04.1

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