Errata patches for expat have been released for OpenBSD 6.4 and 6.5.
Libexpat 2.2.6 was affected by the heap overflow CVE-2019-15903.
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
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