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unbound

NLnet Labs Unbound versions 1.7.0 through 1.25.1 have a vulnerability where an auth/rpz zone with a primary hostname resolving to BOGUS A/AAAA records is still treated as a valid XFR endpoint. An attacker who can spoof the hostname's A/AAAA record without needing a valid RRSIG can become the zone's XFR primary and replace the entire zone or the resolver's response policy. This vulnerability has a CVSS score of 6.5 (medium severity).

In NLnet Labs Unbound versions 1.7.0 up to and including 1.25.1, when an authoritative or response policy zone (auth/rpz) has a configured primary hostname that resolves to BOGUS A/AAAA DNS records, the software incorrectly still considers this hostname as a possible zone transfer (XFR) endpoint. This flaw allows a malicious actor capable of spoofing the A/AAAA DNS records of the primary hostname—without requiring valid DNSSEC signatures (RRSIG)—to become the zone's XFR primary server. Consequently, the attacker can replace the entire zone data or the resolver's entire response policy, potentially altering DNS responses.

NLnet Labs Unbound versions 1.7.0 through 1.25.1 have a vulnerability where an auth/rpz zone with a primary hostname resolving to BOGUS A/AAAA records is still treated as a valid XFR endpoint. An attacker who can spoof the hostname's A/AAAA record without needing a valid RRSIG can become the zone's 

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is… (CVE-2026-50248)

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