Errata patches for Mesa have been released for OpenBSD 6.5 and 6.6.

Environment-provided paths are used for dlopen() in mesa, resulting in escalation to the auth group in xlock(1).

Binary updates for the amd64, i386, and arm64 platforms are available
via the syspatch utility. Source code patches can be found on the
respective errata page:

https://www.openbsd.org/errata65.html
https://www.openbsd.org/errata66.html

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