Errata patches for dhcpd have been released for OpenBSD 6.5 and 6.6.
dhcpd could reference freed memory after releasing a lease with an
unusually long uid.
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
After patching, restart the dhcpd service.
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