CVE-2026-13321
highThe BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
Vendor / product: Isc — bind
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 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.
CVSS
8.6
8.6 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N Severity source: NVD CVSS v3.1 (security-officer@isc.org)
Timeline (UTC)
Published: 2026-07-22 15:16
Modified: 2026-11-02 17:51
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 ≥9.11.0 ≤9.18.50, ≥9.11.3 ≤9.18.50, ≥9.20.0 ≤9.20.24, ≥9.20.9 ≤9.20.24, ≥9.21.0 ≤9.21.23
Weakness classification (CWE)
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-2026-13321
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-2026-13321 security-officer@isc.org
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:34 UTC · record ↗