CVE-2026-11331
High
Description
An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductIsc Bind
PublishedJul 22, 2026
First seenJul 22, 2026
Weakness typeCWE-790CWE-790
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| isc bind | 9.16.8 ≤ v ≤ 9.18.50, 9.18.0 ≤ v ≤ 9.18.50, 9.20.0 ≤ v ≤ 9.20.24, 9.20.9 ≤ v ≤ 9.20.24, 9.21.0 ≤ v ≤ 9.21.23 | — |
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