OS Command Injection Affecting libssh package, versions *


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.12% (2nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-LIBSSH-18179325
  • published22 Oct 2026
  • disclosed21 Jul 2026

Introduced: 21 Jul 2026

CVE-2026-59846  (opens in a new tab)
CWE-78  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:20.04 libssh.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh package and not the libssh package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior.

CVSS Base Scores

version 3.1