What is CVE-2026-19941?

CVE-2026-19941 is a medium-severity vulnerability in Isc Bind 9, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.9/10. Published 2026-09-16.

How severe is CVE-2026-19941?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Isc Bind 9

CVE-2026-19941

An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Isc Bind 9

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

security-officer@isc.org (vendor-advisory)
security-officer@isc.org (patch)
security-officer@isc.org (patch)

Frequently asked questions

What is CVE-2026-19941?: CVE-2026-19941 is a medium-severity vulnerability in Isc Bind 9, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.9/10. Published 2026-09-16.
How severe is CVE-2026-19941?: Medium severity. CVSS v3 base score is 5.9 out of 10.