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.

A flaw was found in tmux. A local attacker could exploit a use-after-free vulnerability in the `image_free` function, potentially leading to information disclosure or denial of service. Exploitation of this flaw is considered difficult due to its high complexity.

This flaw in tmux is rated as Low impact. Exploitation requires local access and is considered difficult due to the high complexity of the attack, limiting the risk to systems where an attacker already has user-level access. The vulnerability could lead to information disclosure or denial of service. Red Hat Enterprise Linux 10 Fix deferred tmux Red Hat Enterprise Linux 7 Fix deferred tmux Red Hat Enterprise Linux 8 Fix deferred tmux Red Hat Enterprise Linux 9 Fix deferred tmux Red Hat OpenShift Container Platform 4 Under investigation rhcos https://www.cve.org/CVERecord?id=CVE-2026-11623 https://nvd.nist.gov/vuln/detail/CVE-2026-11623 https://gist.github.com/XlabAITeam/f0d9952595f795129a3258ba73bbc3cb https://github.com/tmux/tmux/ https://github.com/tmux/tmux/commit/fc6d94a9f8a593bd8b7031650802084385d4ee03 https://github.com/tmux/tmux/releases/tag/3.7-rc https://vuldb.com/cve/CVE-2026-11623 https://vuldb.com/submit/835623 https://vuldb.com/vuln/369303 https://vuldb.com/vuln/369303/cti