CVE-2026-3593

7.4 HIGH
Published: May 20, 2026 Modified: May 21, 2026
View on NVD

Description

A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://downloads.isc.org/isc/bind9/9.20.23
Source: security-officer@isc.org
Patch
https://downloads.isc.org/isc/bind9/9.21.22
Source: security-officer@isc.org
Patch
https://kb.isc.org/docs/cve-2026-3593
Source: security-officer@isc.org
Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.4 / 10.0
EPSS (Exploit Probability)
1.6%
73th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

isc