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unbound

NLnet Labs Unbound versions 1.25.0 through 1.25.1 contain a vulnerability where a fix intended to enable cooperation between the 'respip' and 'dns64' modules creates a shallow copy of the view name. Under memory pressure and specific configurations involving 'respip'/'rpz' modules and subquery-attaching modules, this can lead to memory corruption if the original view name owner is removed. The likelihood of a crash is low and depends on memory allocator behavior. Debug memory builds can detect and terminate the server on free errors.

In NLnet Labs Unbound versions 1.25.0 up to and including 1.25.1, a fix designed to allow the 'respip' and 'dns64' modules to work together creates a shallow copy of the view name in effect. If Unbound is configured with 'respip' or 'rpz' modules alongside modules that attach subqueries (such as respip CNAME redirection, dns64, subnetcache) and an 'access-control-view', and the server is under memory pressure causing slow queries to be dropped, the shallow copy of the view name may become invalid if the original owner is removed. This can lead to memory corruption. The probability of a crash is low and depends on the underlying memory allocator and layout. Debug memory builds like ASAN can detect the issue and terminate the server.

NLnet Labs Unbound versions 1.25.0 through 1.25.1 contain a vulnerability where a fix intended to enable cooperation between the 'respip' and 'dns64' modules creates a shallow copy of the view name. Under memory pressure and specific configurations involving 'respip'/'rpz' modules and subquery-attac

In NLnet Labs Unbound 1.25.0 up to and including 1.25.1, a fix that makes the 'respip' and 'dns64' modules work together, creates a shallow copy of… (CVE-2026-52863)

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