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CVE-2026-5946 is a denial-of-service vulnerability in ISC BIND 9's named daemon caused by improper handling of DNS messages whose CLASS is not Internet (IN), including classes such as CHAOS and HESIOD, as well as meta-classes such as ANY and NONE when present in the question section. Specially crafted requests that reach affected code paths—including recursion, dynamic update processing (UPDATE), zone change notification handling (NOTIFY), or processing of IN-specific record types in non-IN data—can trigger assertion failures in named, causing the process to terminate unexpectedly. Reported affected versions are BIND 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
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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.
named process, terminating the daemon and producing a denial of service. The primary impact is loss of DNS availability for affected recursive resolvers and/or authoritative servers until the service is restarted or otherwise recovered. Based on the provided information, there is no indication of confidentiality or integrity impact; the documented effect is service disruption.If you can’t patch tonight, do this now.
named instances to untrusted DNS traffic where operationally feasible, restricting access to interfaces or functions not required, and monitoring/restarting the service if crashes occur until patches can be applied. The authoritative mitigation is vendor patching.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.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper handling vulnerability in ISC BIND 9 for non-IN class queries that could disrupt DNS processing logic.
A critical BIND 9 termination vulnerability caused by improper handling of non-IN data classes such as CHAOS or HESIOD, enabling crafted requests to trigger assertion failures and terminate the named process.
A BIND 9 vulnerability involving invalid handling of DNS records where CLASS is not IN.
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.