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CVE-2026-11721 is a remotely exploitable cache poisoning vulnerability in BIND 9 and BIND Supported Preview Edition. The flaw occurs during DNSSEC-related wildcard synthesis when an attacker-controlled zone returns an RRSIG whose label count is smaller than the zone in which the RRSIG is contained. Under these conditions, named can synthesize a wildcard name for a zone that is shorter than the attacker’s zone. This incorrect handling of signed DNS data can cause the resolver to accept and cache forged or improperly scoped information, creating a cache poisoning condition. Affected versions include BIND 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
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No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A BIND cache-poisoning vulnerability caused by a label-count mismatch condition.
A high-severity remotely exploitable cache poisoning vulnerability in BIND 9 involving a label count discrepancy in RRSIG handling with wildcards, causing named to synthesize an incorrect wildcard name and potentially poison the resolver cache.
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.