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Ubuntu 26.04 tmux Critical Denial of Service USN-8428-1 CVE-2026-11623

ubuntu
Calendar Grey June 15, 2026
Dist Ubuntu Esm H88
tmux crashes due to crafted input, leading to potential Denial of Service. Update to Ubuntu 26.04 LTS versions to fix.
tmux could be made to crash if it received specially crafted input.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS Summary: tmux could be made to crash if it received specially crafted input. Software Description: - tmux: terminal multiplexer Details: It was discovered that tmux incorrectly handled image cleanup, leading to a use-after-free vulnerability. A local attacker could possibly use this issue to cause tmux to crash, resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu local attack tmux

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS tmux 3.6a-2ubuntu0.1 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8428-1

CVE-2026-11623

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8428-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu local attack tmux

Package Information

https://launchpad.net/ubuntu/+source/tmux/3.6a-2ubuntu0.1

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