Errata patches for OpenSMTPD have been released for OpenBSD 6.4 and 6.5.
smtpd can crash on excessively large input, causing a denial of service.
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/errata64.html
https://www.openbsd.org/errata65.html
After patching, restart the smtpd service.
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