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[USN-8722-1] libssh2 vulnerabilities

Posted on 03 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8722-1
September 03, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in libssh2.

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

Details:

It was discovered that libssh2 incorrectly handled certain SFTP server
responses. A remote attacker controlling an SSH server could use this issue
to cause libssh2 to crash or possibly execute arbitrary code.
(CVE-2026-66032)

It was discovered that libssh2 incorrectly handled AES-GCM cipher
negotiation. A remote attacker controlling an SSH server could possibly use
this issue to cause libssh2 to crash, resulting in a denial of service.
(CVE-2026-66033)

It was discovered that libssh2 incorrectly handled Encrypt-then-MAC cipher
negotiation. A remote attacker controlling an SSH server could use this
issue to cause libssh2 to crash or possibly execute arbitrary code.
(CVE-2026-66035)

Update instructions:

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

Ubuntu 26.04 LTS
libssh2-1t64 1.11.1-1ubuntu0.26.04.4

Ubuntu 24.04 LTS
libssh2-1t64 1.11.0-4.1ubuntu0.24.04.4

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

References:
https://ubuntu.com/security/notices/USN-8722-1
CVE-2026-66032, CVE-2026-66033, CVE-2026-66035

Package Information:
https://launchpad.net/ubuntu/+source/libssh2/1.11.1-1ubuntu0.26.04.4
https://launchpad.net/ubuntu/+source/libssh2/1.11.0-4.1ubuntu0.24.04.4

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