What is CVE-2026-3104?

CVE-2026-3104 is a high-severity vulnerability in Isc Bind, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2026-03-25.

How severe is CVE-2026-3104?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Isc Bind

CVE-2026-3104

A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 ve…

EPSS: 0.001 (16.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Isc Bind
Isc Bind 9 — versions 9.20.0, 9.21.0, 9.20.9-S1

Weakness classification (CWE)

References

security-officer@isc.org (vendor-advisory, Vendor Advisory)
security-officer@isc.org (Patch, patch)
security-officer@isc.org (Patch, patch)

Frequently asked questions

What is CVE-2026-3104?: CVE-2026-3104 is a high-severity vulnerability in Isc Bind, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2026-03-25.
How severe is CVE-2026-3104?: High severity. CVSS v3 base score is 7.5 out of 10.