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CVE-2026-3593

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

Published: May 20, 2026Updated: May 20, 2026 Sources: CVE List NVD
NVD MITRE
7.4CVSS
HIGH

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:H
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

Weaknesses

CWE-416

Affected Products

BIND 9
ISC

Attack Graph

Products CVE Techniques Tactics

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Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

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

Timeline

Published
May 20, 2026
Last Updated
May 20, 2026

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