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CVE-2026-19667 is a remotely exploitable denial-of-service vulnerability in BIND 9's named daemon. In dns_ncache_add(), a negative DNS response with a size of exactly 65,536 bytes undergoes 16-bit length truncation, resulting in creation of a zero-byte negative-cache entry. When named subsequently reads this malformed entry, it triggers an assertion failure and aborts. 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 the affected Supported Preview Edition release ranges.
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No public exploit code observed for this vulnerability.
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A high-severity remotely exploitable BIND 9 denial-of-service vulnerability involving crafted DNS-over-HTTPS requests.
A high-severity, remotely exploitable denial-of-service vulnerability in BIND 9 named. A precisely 65,536-byte negative DNS response triggers 16-bit length truncation during negative-cache insertion, creating a zero-byte entry; reading that entry causes named to abort.
A network-reachable, low-complexity vulnerability with no required privileges or user interaction. The supplied CVSS v3 vector indicates no confidentiality or integrity impact but high availability impact. The content identifies Debian Linux versions 12.0, 13.0, and 14.0 as affected, but does not specify the underlying vulnerable component or flaw mechanism.
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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.