CVE-2026-3104

Name: CVE-2026-3104
Creator: NVD / NIST
Published: 2026-03-25T14:16:36.89+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.61%

Last modified Jun 17, 2026

CVE-2026-3104 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

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 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.61%

44.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Isc	Bind	>= 9.20.0, < 9.20.21
Isc	Bind	>= 9.21.0, < 9.21.20

References

https://downloads.isc.org/isc/bind9/9.20.21Patch
https://downloads.isc.org/isc/bind9/9.21.20Patch
https://kb.isc.org/docs/cve-2026-3104Vendor Advisory

Timeline

Published: Mar 25, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3104?

How severe is CVE-2026-3104?

CVE-2026-3104 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3104?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3104?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST