Errata patches for OpenBGPD have been released for OpenBSD 6.6.

bgpd(8) can crash on nexthop changes or during startup in certain configurations.

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/errata66.html

After patching, restart the bgpd service if it's enabled.

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