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VULNERABILITIES

CVE-2026-3593 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA: redhat-SADPCVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:7412 redhat-SADP
https://access.redhat.com/security/cve/CVE-2026-3593 redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2479770 redhat-SADP
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3593.json redhat-SADP
https://downloads.isc.org/isc/bind9/9.20.23 [email protected]Patch

see all 7 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After Free[email protected]
CWE-825Expired Pointer Dereferenceredhat-SADP

Affected Products

ProductVersions
isc bind
>= 9.20.0, < 9.20.23
>= 9.21.0, < 9.21.22

CPE

  • cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-3593
NVD Published Date:
May 20, 2026
NVD Last Modified:
Aug 24, 2026
Source:
[email protected]
CVE-2026-3593 Details - Not Deferred