Hi, The following vulnerability was published for tmux. CVE-2026-11623[0]: | 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. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-11623 https://www.cve.org/CVERecord?id=CVE-2026-11623 [1] https://github.com/tmux/tmux/commit/fc6d94a9f8a593bd8b7031650802084385d4ee03 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
This was fixed upstream in 3.6b with https://github.com/tmux/tmux/commit/b8434182c9ead062be8d50a1ff88e98b41108c1f, and integrated in 3.6b-1 with https://salsa.debian.org/debian/tmux/-/commit/3a78785ba1a01def74d2b22258f6c1201be75517. Cheers,
Hi, According to: https://ubuntu.com/security/CVE-2026-11623 this was introduced in v3.6a. Also this requires SIXEL support which was introduced in v3.4. Cheers! Sylvain Beucler Debian LTS Team
Hi, Seb, was is your take here? Regards, Salvatore
I agree with Marc's take, that the issue was introduced in 3.6a with c77d49f67. Cheers,