CVE-2026-3593

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

20/05/2026

Last modified:

15/07/2026

Description

A use-after-free vulnerability exists within the DNS-over-HTTPS implementation.<br /> 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.<br /> BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.40 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): High

Base Score 3.x

7.40

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:isc:bind:::::-:::*	9.20.0 (including)	9.20.23 (excluding)
cpe:2.3:a:isc:bind:::::-:::*	9.21.0 (including)	9.21.22 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-3593

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools