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unbound

NLnet Labs Unbound versions 1.13.2 through 1.25.1 contain a vulnerability in the handling of stub or forward zones below an intermediate label under a DNSSEC signed zone. An off-by-one error in the 'harden-below-nxdomain' logic causes the DNS resolver to incorrectly return a secure NXDOMAIN answer from the parent zone, bypassing the configured stub or forward zone and preventing the upstream server from being contacted. This issue is enabled by default and affects DNS resolution behavior for certain nested private namespaces.

In NLnet Labs Unbound versions 1.13.2 up to and including 1.25.1, an off-by-one error in the 'harden-below-nxdomain' feature causes stub or forward zones configured below an intermediate label under a DNSSEC signed zone to be shadowed by the intermediate label's secure NXDOMAIN response from the parent. The error occurs because the delegation point guard tests the domain name before stripping a label, leading to a cache walk that returns a DNSSEC-secure NXDOMAIN from the parent zone instead of querying the configured stub/forward zone upstream. This results in the upstream server never being contacted for queries to the intermediate label, effectively bypassing the stub or forward zone configuration.

NLnet Labs Unbound versions 1.13.2 through 1.25.1 contain a vulnerability in the handling of stub or forward zones below an intermediate label under a DNSSEC signed zone. An off-by-one error in the 'harden-below-nxdomain' logic causes the DNS resolver to incorrectly return a secure NXDOMAIN answer f

In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed… (CVE-2026-44687)

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