CVE-2026-3593 — HIGH (7.4) — White Hats Nepal

Q: How severe is CVE-2026-3593?

CVE-2026-3593 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-3593?

Check the references section above for vendor advisories and patch information. Affected products include: Isc Bind.

Vulnerability 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.

CVSS Score

7.4

HIGH

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

Affected Products

Vendor	Product	Versions
Isc	Bind	>= 9.20.0, < 9.20.23

Related Weaknesses (CWE)

CWE-416

References

https://downloads.isc.org/isc/bind9/9.20.23Patch
https://downloads.isc.org/isc/bind9/9.21.22Patch
https://kb.isc.org/docs/cve-2026-3593Vendor Advisory

FAQ

What is CVE-2026-3593?

CVE-2026-3593 is a vulnerability with a CVSS score of 7.4 (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. BIN...

How severe is CVE-2026-3593?

CVE-2026-3593 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-3593?

Check the references section above for vendor advisories and patch information. Affected products include: Isc Bind.