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CVE-2026-11331 is a remotely exploitable flaw in BIND 9's Response Policy Zone processing when wildcard CNAME policies are in use. An attacker who knows or can infer that a resolver applies RPZ wildcard CNAME rules can send specially crafted DNS queries with names long enough to trigger a NAMETOOLONG error during RPZ evaluation. BIND 9 does not correctly handle this error condition in that code path, which can cause the intended RPZ rule to be skipped and, in some cases, can also cause the named process to exit unexpectedly. Affected versions are BIND 9 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-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.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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