CVE-2026-50243

Popis

In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the -respip- module in front of the validator together with a -response-ip- redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer and can instead rewrite a BOGUS A/AAAA answer to point to an operator-s configured IP. If the validator finds an expired or otherwise invalid RRSIG on an answer whose A record falls within a -response-ip-/RPZ configuration, the answer is still rewritten and given a hard coded security level of INSECURE. This results in the client receiving an INSECURE NOERROR reply rewritten by the operator-s configured IP. A malicious actor can exploit the possible poisonous effect by spoofing a BOGUS A/AAAA answer that falls inside the operator-s configured subnet rewrites. Such DNSSEC protected answers are then insecurely redirected to the operator-s configured target.