Detections
Analytics

RHEL 10 : unbound (RHSA-2026:97121)

high Nessus Plugin ID 378133

Synopsis

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

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:97121 advisory.

 The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

 Security Fix(es):

 * unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance (CVE-2026-42960)

 * unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS (CVE-2026-42923)

 * unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload (CVE-2026-44608)

 Bug Fix(es) and Enhancement(s):

 * Update to latest 1.26 (JIRA:RHEL-246536)

 * [RHEL-10][AppStream] Packages present in comps but missing from repo: unbound (JIRA:RHEL-171309)

 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.

 Additional Changes:

 For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from 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 affected packages.

See Also

https://access.redhat.com/errata/RHSA-2026:97121

https://access.redhat.com/security/updates/classification/#moderate

https://bugzilla.redhat.com/show_bug.cgi?id=2479821

https://bugzilla.redhat.com/show_bug.cgi?id=2479825

https://bugzilla.redhat.com/show_bug.cgi?id=2480126

https://issues.redhat.com/browse/RHEL-246536

http://www.nessus.org/u?aa9dbcbc

http://www.nessus.org/u?da9d996a

Plugin Details

Severity: High

ID: 378133

File Name: redhat-RHSA-2026-97121.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/10/2026

Updated: 11/10/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.5

Percentile: 98.1

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-42960

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-44608

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.3, p-cpe:/a:redhat:enterprise_linux:python3-unbound, p-cpe:/a:redhat:enterprise_linux:unbound-anchor, p-cpe:/a:redhat:enterprise_linux:unbound-devel, p-cpe:/a:redhat:enterprise_linux:unbound-dracut, p-cpe:/a:redhat:enterprise_linux:unbound-libs, p-cpe:/a:redhat:enterprise_linux:unbound-utils, p-cpe:/a:redhat:enterprise_linux:unbound

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: 11/10/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-42923, CVE-2026-42960, CVE-2026-44608

CWE: 349, 367, 400

RHSA: 2026:97121