PT-2026-42163 · Isc+3 · Bind 9+3

Published 2026-05-17 · Updated 2026-05-28 · CVE-2026-5946

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions BIND 9 versions 9.11.0 through 9.16.50 BIND 9 versions 9.18.0 through 9.18.48 BIND 9 versions 9.20.0 through 9.20.22 BIND 9 versions 9.21.0 through 9.21.21 BIND 9 versions 9.11.3-S1 through 9.16.50-S1 BIND 9 versions 9.18.11-S1 through 9.18.48-S1 BIND 9 versions 9.20.9-S1 through 9.20.22-S1

Description Multiple flaws exist in named regarding the handling of DNS messages where the CLASS is not Internet (IN), such as CHAOS or HESIOD, or messages specifying meta-classes like ANY or NONE in the question section. Specially crafted requests targeting code paths related to recursion, dynamic updates (UPDATE), zone change notifications (NOTIFY), or the processing of IN-specific record types in non-IN data can trigger assertion failures in named.

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

Out of bounds Read

RCE

Assertion Failure

Type Confusion

Improper Check for Exceptional Conditions

Weakness Enumeration

CWE-125

CWE-20

CWE-617

CWE-843

CWE-754

Related Identifiers

CVE-2026-5946

ECHO-A977-35CE-16DF

OPENSUSE-SU-2026:10874-1

RHSA-2026:20334

USN-8293-1

Affected Products

Bind 9

Bind Server

Linuxmint

Ubuntu

References · 29

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5946 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3592 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8293-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-3593 · Vendor Advisory
• https://downloads.isc.org/isc/bind9/9.21.22 · Patch
• https://downloads.isc.org/isc/bind9/9.18.49 · Patch
• https://ubuntu.com/security/notices/USN-8293-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5947 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5950 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-5946 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5946 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10874-1 · Vendor Advisory
• https://kb.isc.org/docs/cve-2026-5946 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5946 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-5946 · Vendor Advisory