Errata patches for pledge tmppath and unveil unmount in kernel have
been released for OpenBSD 7.7 and 7.8.  You may have to update some
ports or packages before using that kernel.

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

  https://www.openbsd.org/errata77.html
  https://www.openbsd.org/errata78.html