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unbound

NLnet Labs Unbound versions 1.6.0 through 1.25.1 contain a vulnerability where a replayed wildcard resource record set (rrset) can be temporarily considered DNSSEC secure based on RRSIG validation alone, before later being marked bogus after NSEC validation. This can lead to a race condition in the serve expired path where a poisoned rrset is cached with a secure status, allowing an attacker to cause a specific DNS record to be replaced by a wildcard record. Exploitation requires injection of a signed wildcard rrset without accompanying NSEC records and involves DNSSEC-signed domains with CNAME wrappers pointing to records adjacent to wildcards. The CVSS score is 3.7 (medium severity).

In NLnet Labs Unbound versions 1.6.0 up to and including 1.25.1, a vulnerability exists in the DNSSEC validation process involving replay of a wildcard rrset. Initially, the replayed wildcard rrset is accepted as secure based on RRSIG validation and cached. Later, NSEC validation marks it as bogus. However, due to a race condition in the serve expired path, another thread may serve the cached rrset with a secure status, effectively poisoning the cache. An attacker can exploit this by using any DNSSEC-signed domain with a CNAME wrapper pointing to a record adjacent to a wildcard, causing the poisoned rrset to replace the specific record with the wildcard. This requires injection of the signed wildcard rrset without the NSEC accompanying rrset. The vulnerability affects the serve expired path and can cause incorrect DNS responses.

NLnet Labs Unbound versions 1.6.0 through 1.25.1 contain a vulnerability where a replayed wildcard resource record set (rrset) can be temporarily considered DNSSEC secure based on RRSIG validation alone, before later being marked bogus after NSEC validation. This can lead to a race condition in the 

In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, a replay of a wildcard rrset as another piece of data, could be briefly considered DNSSEC… (CVE-2026-46582)

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