CVE-2026-11623
MediumCVSS 4.5Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
Tmux up to version 3.6a contains a use-after-free vulnerability in the image_free function in image.c. The attack requires local access and is difficult to exploit. An exploit has been publicly disclosed. The issue is fixed in version 3.7-rc.
Risk Assessment
A local user can exploit this vulnerability to execute code in the context of the tmux process, potentially leading to privilege escalation or system instability. The risk is moderate due to required local access and high attack complexity.
Recommendation
Update tmux to version 3.7-rc or later. Restrict local system access to trusted users only.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

