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CVE-2026-13321 is a high-severity DNSSEC validation bypass vulnerability in BIND 9. The flaw is in resolver handling of DNSSEC-signed NSEC records: BIND accepts validly signed NSEC records even when the NSEC "Next Domain Name" field points outside the signer’s authoritative zone. This breaks expected zone-boundary validation semantics and allows an attacker to construct NSEC coverage that improperly spans into other zones. As a result, a malicious actor controlling any DNSSEC-signed zone can induce the resolver to cache forged negative answers for names in unrelated victim zones while treating those responses as authenticated.
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No public exploit code observed for this vulnerability.
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A high-severity DNSSEC validation bypass vulnerability in BIND 9 resolvers that improperly accept signed NSEC records whose Next Domain Name points outside the signer’s zone, enabling cross-zone cache poisoning with authenticated denial-of-service responses.
An integrity-impacting vulnerability in ISC BIND 9 resolver validation logic where validly-signed NSEC records can be accepted even when the Next Domain Name points outside the signer's zone.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.