PgBouncer 1.26.0 came out on September 23 and fixes three CVEs. Two of them can be triggered by anyone who can open a TCP connection to the listener. They need no password and no valid username. If PgBouncer sits anywhere a hostile packet can reach it, upgrade before you finish reading this.
Suppose a major manufacturer of computer keyboards announced a very serious security problem with a specific competitor’s keyboard: Someone could plug this keyboard into a computer running a malicious app, and cause a user to enter sensitive information. Thus, the manufacturer demands that their competitor recall all of these “insecure” keyboards.