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CVE-2026-50248

6.5 medium SSVC exploitation: none Analyzed
NVD · CVE.org

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 6.5 · nlnetlabsNVD modified 2026-10-24 13:10

Affected (CPE criteria) 1

  • cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*

References 1