CVE-2026-11331

ADVISORY - debian

Summary

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.

bind9 1:9.20.26-1 https://kb.isc.org/docs/cve-2026-11331

EPSS Score⁠: 0.00416 (0.340)

Common Weakness Enumeration (CWE)

Impacted images

Advisories

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