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CVE-2026-19666 is a use-after-free vulnerability in BIND 9 resolver processing. The flaw occurs in query_addnoqnameproof() when reached through the DNS64 filter64 path. A resolver configured with DNS64 can be caused to terminate unexpectedly when it processes a specifically malformed applicable response from an authoritative server. Affected releases include BIND 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and corresponding Supported Preview Edition ranges.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity remotely exploitable BIND 9 denial-of-service vulnerability involving malformed authoritative-server answers.
A denial-of-service vulnerability in BIND 9 DNS64-enabled resolvers. A specifically malformed applicable authoritative DNS answer can cause the named resolver process to terminate unexpectedly.
A high-severity, remotely exploitable use-after-free vulnerability in BIND 9's DNS64 filter64 processing path. A specially malformed authoritative DNS answer can cause the named resolver process to terminate, producing a denial of service.
A remotely reachable, low-complexity, unauthenticated vulnerability affecting Debian Linux 12.0, 13.0, and 14.0. The supplied CVSS v3 vector indicates no confidentiality or integrity impact but high availability impact.
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.