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.
History

Wed, 20 May 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 20 May 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation
First Time appeared Isc
Isc bind
Weaknesses CWE-416
CPEs cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
Vendors & Products Isc
Isc bind
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: isc

Published:

Updated: 2026-05-20T13:40:45.166Z

Reserved: 2026-03-05T12:57:16.981Z

Link: CVE-2026-3593

cve-icon Vulnrichment

Updated: 2026-05-20T13:40:40.119Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-20T13:16:23.923

Modified: 2026-05-20T14:04:57.320

Link: CVE-2026-3593

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-20T15:15:06Z