CoreDNS: rewrite-plugin EDNS0 response-revert nil-pointer panic (remote DoS) when a downstream plugin returns a response with no OPT record

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CVE-2026-62299

CoreDNS (rewrite plugin, edns0.go) prior to version 1.14.5 could panic when a downstream plugin returns a response with no OPT record. The code path in edns0.go dereferenced a DNS OPT without a nil check, triggered by a query matching a rewrite edns0 rule (local/nsid/subnet with set/append/replac...