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CVE-2026-52863 is a memory corruption vulnerability in NLnet Labs Unbound affecting versions 1.25.0 through 1.25.1. The flaw was introduced by a fix intended to make the respip and dns64 modules work together. In the affected code path, a subquery receives a shallow copy of the active view name instead of owning an independent copy. When Unbound is operating under pressure and its jostle logic drops slow queries, the original super query that owns the view name can be removed before the subquery finishes using that data. This leaves the subquery referencing freed memory, creating a use-after-free style memory corruption condition. The issue arises in configurations that combine response-policy functionality such as respip or rpz with modules capable of attaching subqueries, including respip CNAME redirection, dns64, or subnetcache, together with access-control-view support.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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