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Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / Pro Realtime 22.04 LTS : libssh2 vulnerabilities (USN-8799-1)

medium Nessus Plugin ID 349108

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / Pro Realtime 22.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-8799-1 advisory.

 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)

 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 did not properly check bounds in certain

 publickey subsystem responses. A remote attacker controlling a malicious

 SSH server could use this issue to cause a denial of service or possibly

 execute arbitrary code.. (CVE-2026-66034)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected libssh2-1 package.

See Also

https://ubuntu.com/security/notices/USN-8799-1

Plugin Details

Severity: Medium

ID: 349108

File Name: ubuntu_USN-8799-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/22/2026

Updated: 9/22/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:libssh2-1

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 9/22/2026

Vulnerability Publication Date: 9/22/2026

Reference Information

USN: 8799-1