checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Affected scope and exposure questions

The current feed maps ISC/BIND 9 (generic). Check affected ranges and fixed versions before updating.

Recommended response

1. 1Check inventory. Check lockfiles and deployed manifests for ISC/BIND 9.
2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

1. Published upstream

   Sep 16, 2026

   Evidence: source:cvelist:source_dates:source-dates:record

2. Source modified

   Sep 16, 2026

   Evidence: source:cvelist:source_dates:source-dates:record

3. First seen by HOL

   Sep 16, 2026

Sources and claim methodology

• Source referencedownloads.isc.org
• Source referencedownloads.isc.org
• Source referencekb.isc.org

Related CVEs

• Unauthenticated IXFR deltas are applied to the live zone before TSIG verificationSame isc/bind 9 package
• qpcache NOQNAME proof use-after-free crashes recursive resolverSame isc/bind 9 package
• Use-after-free in query_addnoqnameproof() via the DNS64 filter64 pathSame isc/bind 9 package
• Remote assertion failure via 16-bit length truncation in `dns_ncache_add()`Same isc/bind 9 package
• Resource Exhaustion via Excessive DNSSEC Cryptographic Material MatchingSame isc/bind 9 package
• Message parser retains every identical singleton RDATA, enabling wire-to-work amplificationSame isc/bind 9 package