012. tmux prints an access refusal and exits 0

Date

not recorded

Agents

tmux

Measured on

not recorded

Measured

The first deployment of tg-bridge, in August 2026, with tmux 3.5a. The fact records no exact date.

What was measured

A tmux server accepts its own user only. Each other user gets access not allowed, whatever the mode and the group of the socket permit. tmux server-access -a -w <user> gives a user access, and only the owner of the server can change that list. tmux prints the refusal and then exits 0.

Mechanism

The exit status of tmux does not show an access refusal. A tool must assert a result, for example the output of a query, and never the exit status alone.

Incident

None recorded.

Screens

None.

Not measured

Other tmux versions.

Source

Measured by the tg-bridge project. The text is a summary of its notes, and it holds no host details and no session details.