Out-of-Bounds Affecting tmux package, versions <3.6b-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.12% (3rd percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-TMUX-17262736
  • published9 Jun 2026
  • disclosed9 Jun 2026

Introduced: 9 Jun 2026

CVE-2026-11623  (opens in a new tab)
CWE-119  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Debian:unstable tmux to version 3.6b-1 or higher.

NVD Description

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

A security vulnerability has been detected in tmux up to 3.6a. Affected is the function image_free of the file image.c. Such manipulation leads to use after free. Local access is required to approach this attack. This attack is characterized by high complexity. The exploitability is told to be difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 3.7-rc is able to address this issue. The name of the patch is fc6d94a9f8a593bd8b7031650802084385d4ee03. The affected component should be upgraded.

CVSS Base Scores

version 3.1