ALPINE-CVE-2026-44687
ALPINE-CVE-2026-44687
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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 zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in 'harden-below-nxdomain' logic; enabled by default. It effectively bypasses the configuration and the configured stub/forward zone is never contacted. 'harden-below-nxdomain' does an upward DNS cache walk together with a delegation point guard that does not allow NXDOMAIN synthesis above stub/forward zones. The guard tests the domain name but before stripping a label. This results in an iteration where the domain name equals the configured stub/forward zone apex that passes the guard, strips one more label, and probes the cache at the apex's immediate public parent. If that parent has a cached DNSSEC-secure NXDOMAIN, which it will for any private namespace nested two or more labels under a signed public name, the walk returns it and the configured stub/forward upstream is never contacted. This can only be triggered by the query for the intermediate label (between the stub/forward apex and the DNSSEC parent zone).
CVSS 3.7 · Faible · Correctif disponible
- Publication
- Mise à jour
Pile logicielle: system
Produits et versions concernés
unbound Alpine:v3.22
- Plages de versions concernées
- ECOSYSTEM: ≥ 1.13.2, < 1.25.2-r0
Mettez à jour vers 1.25.2-r0
unbound Alpine:v3.23
- Plages de versions concernées
- ECOSYSTEM: ≥ 1.13.2, < 1.25.2-r0
Mettez à jour vers 1.25.2-r0
unbound Alpine:v3.24
- Plages de versions concernées
- ECOSYSTEM: ≥ 1.13.2, < 1.25.2-r0
Mettez à jour vers 1.25.2-r0