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CVE-2026-3593 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-3593

CVE-2026-3593

HIGH7.4

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

Published May 20, 2026

Modified 2 days ago

Details

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.

References

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

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

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

https://www.cve.org/CVERecord?id=CVE-2026-3593

CVSS Analysis

CVSS v3.1

7.4

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

HighAC:H

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

HighA:H

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

Weakness Type (CWE)

Memory Safety

Ecosystems

Timeline

PublishedMay 20, 2026

ModifiedMay 20, 2026