CVE-2026-3593

Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation

Published: May 20, 2026Updated: Aug 24, 2026 Sources: CVE List NVDCWE-416

7.4HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-416 CWE-825

Affected Products

ISC

commercial·USaka internet systems consortium

bind

Networking Infrastructure

BIND 9

Networking Infrastructure

Exploitability

0 exploit sources identified

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Official Patch Available

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

Privilege Escalation

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References

https://downloads.isc.org/isc/bind9/9.20.23

downloads.isc.org

https://downloads.isc.org/isc/bind9/9.21.22

downloads.isc.org

https://kb.isc.org/docs/cve-2026-3593

kb.isc.org

and 4 more references View all →

News mentions

⚡ Weekly Recap: New Linux Flaw, PAN-OS Exploit, AI-Powered Attacks, OAuth Phishing and More
en·The Hacker News·Jun 1, 2026 Advisory Gogs rce

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