CVE-2026-59846

Publication date 21 July 2026

Last updated 31 August 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

3.9 · Low

Score breakdown

Description

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.

Status

Package Ubuntu Release Status
libssh 26.04 LTS resolute
Fixed 0.11.3-1ubuntu2.1
24.04 LTS noble
Fixed 0.10.6-2ubuntu0.5
22.04 LTS jammy
Fixed 0.9.6-2ubuntu0.22.04.8
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libssh

Severity score breakdown

CVSS version: CVSS v3.0

Base score 3.9 · Low

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-8699-1
    • libssh vulnerabilities
    • 31 August 2026

Other references

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