whether a record would fit into a TCP message buffer.
(CVE-2020-8618) [GL #1850]
+5434. [security] It was possible to trigger an INSIST in
+ lib/dns/rbtdb.c:new_reference() with a particular zone
+ content and query patterns. (CVE-2020-8619) [GL #1111]
+ [GL #1718]
+
5431. [func] Reject DS records at the zone apex when loading
master files. Log but otherwise ignore attempts to
add DS records at the zone apex via UPDATE. [GL #1798]