CVE-2026-59845

Publication date 21 July 2026

Last updated 13 November 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.3 · Medium

Score breakdown

Description

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

Status

Package Ubuntu Release Status
libssh 26.10 stonking
Not affected
26.04 LTS resolute
Fixed in 0.11.3-1ubuntu2.1
24.04 LTS noble
Fixed in 0.10.6-2ubuntu0.5
22.04 LTS jammy
Fixed in 0.9.6-2ubuntu0.22.04.8
20.04 LTS focal
Vulnerable
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Vulnerable

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 5.3 · Medium

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

References

Related Ubuntu Security Notices (USN)

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

Other references

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