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

ubuntu
Calendar Grey June 15, 2026
Scroller 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

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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