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CVE-2026-3593

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CVE-2026-3593

Published: May 20, 2026

Modified: May 20, 2026

PUBLISHED

CVSS v3.1

7.4

HIGH

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.

VendorProductVersions

ISC

BIND 9

affected
9.20.0 - <= 9.20.22
affected
9.21.0 - <= 9.21.21
affected
9.20.9-S1 - <= 9.20.22-S1
unaffected
9.18.0 - <= 9.18.48
unaffected
9.18.11-S1 - <= 9.18.48-S1

Weaknesses (CWE)

CWE-416

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

References

CVE-2026-3593
vendor-advisory

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