Ubuntu has issued an advisory today (November 5): https://ubuntu.com/security/notices/USN-4618-1
openSUSE has issued an advisory for this tomorrow (November 6): https://lists.opensuse.org/opensuse-security-announce/2020-11/msg00022.html The issue appears to be fixed upstream in 3.1c.
More information: https://www.openwall.com/lists/oss-security/2020/11/05/3
Hi, thanks for reporting this. Assigned to the package maintainer. (Please set the status to 'assigned' if you are working on it)
Keywords: (none) => TriagedAssignee: bugsquad => cooker
tmux-3.1c-1.mga8 uploaded for Cauldron.
Resolution: (none) => FIXEDStatus: NEW => RESOLVED