CVE-2026-33278: dangling pointer dereference in dnsmsgdeepcopyregion()
during DS sub-query suspend/resume; the previously-backported
CVE-2023-50387-CVE-2023-50868.patch dragged the vulnerable
'*res->rep = *origin->rep;' struct-assignment into our 1.16.2 tree.
Save the destination rrsets pointer, sized-memcpy with rrsetref
excluded, restore the pointer. Adds defense-in-depth
paramsetsame() NSEC3 parameter consistency check called from all
five nsec3prove* entry points.