RHEL 9 : bind9.18 (RHSA-2026:75578)

high Nessus Plugin ID 363007

Synopsis

The remote Red Hat host is missing one or more security updates for bind9.18.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:75578 advisory.

BIND (Berkeley Internet Name Domain) is an implementation of the DNS (Domain Name System) protocols. BIND includes a DNS server (named), which resolves host names to IP addresses; a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating properly.

Security Fix(es):

* bind: BIND 9: Remote Denial of Service via cached SVCB/HTTPS AliasMode records (CVE-2026-81736)

* bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling (CVE-2026-19667)

* bind: BIND resolver: Denial of Service due to resource exhaustion in SVCB/HTTPS AliasMode processing (CVE-2026-81563)

* bind: BIND: Denial of Service via crafted DNSSEC reply (CVE-2026-80274)

* bind: BIND: Denial of Service via malformed DNS64 responses (CVE-2026-19666)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL bind9.18 package based on the guidance in RHSA-2026:75578.

Plugin Details

Severity: High

ID: 363007

File Name: redhat-RHSA-2026-75578.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 10/5/2026

Updated: 10/5/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.27

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-81736

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9, cpe:/o:redhat:rhel_eus:9.8, p-cpe:/a:redhat:enterprise_linux:bind9.18-chroot, p-cpe:/a:redhat:enterprise_linux:bind9.18-devel, p-cpe:/a:redhat:enterprise_linux:bind9.18-dnssec-utils, p-cpe:/a:redhat:enterprise_linux:bind9.18-doc, p-cpe:/a:redhat:enterprise_linux:bind9.18-libs, p-cpe:/a:redhat:enterprise_linux:bind9.18-utils, p-cpe:/a:redhat:enterprise_linux:bind9.18

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 10/5/2026

Vulnerability Publication Date: 9/16/2026

Reference Information

CVE: CVE-2026-19666, CVE-2026-19667, CVE-2026-80274, CVE-2026-81563, CVE-2026-81736

CWE: 190, 606, 617, 772

RHSA: 2026:75578

Detections

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