CVE-2026-11331

high

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 condi…

Vendor / product: Isc — bind

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.

CVSS

7.5

7.5 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Severity source: NVD CVSS v3.1 (security-officer@isc.org)

Timeline (UTC)

Published: 2026-07-22 15:16

Modified: 2026-11-02 17:45

NVD status: Analyzed

Last synced 1 day ago

Verified against the source API 2026-11-03 07:34 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

isc / bind ≥9.16.8 ≤9.18.50, ≥9.18.0 ≤9.18.50, ≥9.20.0 ≤9.20.24, ≥9.20.9 ≤9.20.24, ≥9.21.0 ≤9.21.23

Weakness classification (CWE)

CWE-790

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://kb.isc.org/docs/cve-2026-11331

References

https://downloads.isc.org/isc/bind9/9.20.26 security-officer@isc.org
https://downloads.isc.org/isc/bind9/9.21.24 security-officer@isc.org
https://kb.isc.org/docs/cve-2026-11331 security-officer@isc.org

Data sources

NVD CVE API 2.0 — fetched 2026-11-03 07:34 UTC · record ↗

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CVE-2026-11331

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