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CVE-2026-46582 is a cache poisoning vulnerability in NLnet Labs Unbound affecting versions 1.6.0 through 1.25.1. During DNSSEC processing, a replayed wildcard RRset can be temporarily accepted as secure based on RRSIG validation alone and written into cache before subsequent NSEC-based wildcard validation correctly determines the response is bogus. In the vulnerable serve-expired reply path, a race between the resolving thread and another thread serving expired data can expose this transient secure state. As a result, a specific sibling record adjacent to a wildcard can be overwritten in cache with the wildcard-derived RRset and marked secure. The flaw arises from incorrect trust being assigned to data before full DNSSEC wildcard validation is complete, combined with cache update behavior on the serve-expired path.
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Cross-references every affected SKU, including bundled OEM variants.
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