Errata patches for npppd have been released for OpenBSD 6.7 and 6.8.
npppd PPTP protocol handler can cause heap over-read leading to a crash.
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/errata67.html https://www.openbsd.org/errata68.html