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[USN-8532-1] libssh2 vulnerabilities

Posted on 13 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8532-1
July 13, 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 publickey
subsystem attributes. A remote attacker controlling a malicious SSH server
could use this issue to cause a denial of service or possibly execute
arbitrary code. (CVE-2026-58050)

It was discovered that libssh2 did not properly initialize publickey list
entries before parsing. A remote attacker controlling a malicious SSH
server could use this issue to cause a denial of service or possibly
execute arbitrary code. (CVE-2026-58051)

Update instructions:

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

Ubuntu 26.04 LTS
libssh2-1t64 1.11.1-1ubuntu0.26.04.3

Ubuntu 24.04 LTS
libssh2-1t64 1.11.0-4.1ubuntu0.24.04.3

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

References:
https://ubuntu.com/security/notices/USN-8532-1
CVE-2026-58050, CVE-2026-58051

Package Information:
https://launchpad.net/ubuntu/+source/libssh2/1.11.1-1ubuntu0.26.04.3
https://launchpad.net/ubuntu/+source/libssh2/1.11.0-4.1ubuntu0.24.04.3

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