PT-2026-42156 · Isc+3 · Bind 9+3

Published 2026-05-17 · Updated 2026-05-31 · CVE-2026-3593

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions BIND 9 versions 9.20.0 through 9.20.22 BIND 9 versions 9.21.0 through 9.21.21 BIND 9 versions 9.20.9-S1 through 9.20.22-S1

Description A heap use-after-free issue exists within the DNS-over-HTTPS implementation. Use-after-free occurs when an application continues to use a pointer after it has been freed, which can lead to crashes or arbitrary code execution.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-3593

ECHO-F320-5F3F-A5AC

OPENSUSE-SU-2026:10915-1

RHSA-2026:7412

USN-8293-1

Affected Products

Bind 9

Bind Server

Linuxmint

Ubuntu

References · 25

• https://downloads.isc.org/isc/bind9/9.20.23 · Patch
• https://ubuntu.com/security/CVE-2026-3593 · Vendor Advisory
• https://kb.isc.org/docs/cve-2026-3593 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8293-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-3593 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-3593 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-3593 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3593 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-3593 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-3593 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-3593 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5947 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3592 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5946 · Vendor Advisory
• https://downloads.isc.org/isc/bind9/9.21.22 · Patch