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Fedora 44 tmux 3.7b Use After Free Bug Advisory 2026

Linuxsecurity •LinuxSecurity Advisories • July 11, 2026

fdf6afc update to 3.7b fixes rhbz#2498485 CHANGES FROM 3.7a TO 3.7b Fix so that the end of a synchronized update again triggers a redraw. CHANGES FROM 3.7 TO 3.7a Fix crash in break-pane when no name is provided. Scrollbar options are now cached rather than being looked up for every redraw (issue 5298). Only forbid #( in names, allow #[, empty names, : and .

* Thu Jul 9 2026 Filipe Rosset - 3.7b-2 - fix 3.7b build * Thu Jul 9 2026 Filipe Rosset - 3.7b-1 - update to 3.7b fixes rhbz#2498485

[ 1 ] Bug #2487530 - CVE-2026-11623 tmux: tmux: Use-after-free vulnerability [fedora-all] [ 2 ] Bug #2498485 - update to 3.7b

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-f5dd9fb83f' at the command line. For more information, refer to the dnf documentation available at

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The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Fedora tmux 3.7b Update Addresses Use-After-Free Vulnerability A use-after-free vulnerability (CVE-2026-11623) was identified in tmux affecting Fedora systems. The flaw could lead to crashes and potential exploitation if not patched. Fedora has released updates for both Fedora 43 and 44 to address this issue, specifically updating tmux to version 3.7b. The updates include fixes for several bugs, including a crash in break-pane when no name is provided. Users are advised to upgrade their tmux installations using the dnf update program. The vulnerability was published on June 9, 2026, and affects all users of tmux in Fedora distributions. The updates were made available on July 9, 2026, and are critical for maintaining system stability and security. 2 sources 46

Extracted Entities

CVEs (1)

CVE-2026-11623

CWE Weaknesses (1)

CWE-416 - Use After Free