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CVE-2026-1519 is a denial-of-service vulnerability in BIND 9 DNSSEC-validating recursive resolvers. During insecure delegation validation, the isdelegation() path invokes isc_iterated_hash() using an NSEC3 iteration value supplied by the zone without enforcing the DNS_NSEC3_MAXITERATIONS limit. A malicious zone can publish NSEC3 records with an extremely high iteration count, causing expensive repeated hashing while the resolver validates DS insecurity proofs. Affected versions are BIND 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and the corresponding listed Supported Preview Edition releases.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
33 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in BIND triggered via a maliciously crafted DNSSEC-validated zone.
A denial-of-service vulnerability in BIND triggered via a maliciously crafted DNSSEC-validated zone.
A denial-of-service vulnerability in BIND triggered via a maliciously crafted DNSSEC-validated zone.
A denial-of-service vulnerability in BIND triggered via a maliciously crafted DNSSEC-validated 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.