What is CVE-2026-19668?

CVE-2026-19668 is a medium-severity vulnerability in Isc Bind 9, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2026-09-16.

How severe is CVE-2026-19668?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Isc Bind 9

CVE-2026-19668

A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. 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 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Isc Bind 9

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

References

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

Frequently asked questions

What is CVE-2026-19668?: CVE-2026-19668 is a medium-severity vulnerability in Isc Bind 9, classified under Inefficient Algorithmic Complexity. CVSS score: 5.3/10. Published 2026-09-16.
How severe is CVE-2026-19668?: Medium severity. CVSS v3 base score is 5.3 out of 10.