Ubuntu alert USN-8309-1 (libssh2)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8309-1] libssh2 vulnerability
Date:
             
 
Tue, 26 May 2026 18:57:59 +0000
Message-ID:
             
 
<E1wRwyV-0005qN-Dx@lists.ubuntu.com>
==========================================================================
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/libssh2/1.11.1-1ubun...
  https://launchpad.net/ubuntu/+source/libssh2/1.11.1-1ubun...
  https://launchpad.net/ubuntu/+source/libssh2/1.11.0-4.1ub...


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