Detections
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RHEL 9 : Satellite 6.17.6.3 Async Update (Important) (RHSA-2026:2764)

high Nessus Plugin ID 299226

Synopsis

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

Description

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:2764 advisory.

 Red Hat Satellite is a system management solution that allows organizations to configure and maintain their systems without the necessity to provide public Internet access to their servers or other client systems. It performs provisioning and configuration management of predefined standard operating environments.

 Security Fix(es):

 * python-urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

 * python-urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) (CVE-2026-21441)

 * python-urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

 Bug Fix(es):

 * Satellite upgrade from 6.17.5 to 6.18 failed during Pulpcore database migration due to incompatible versions detected for some of the pulpcore plugins (SAT-41761)

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 python3.11-urllib3 package.

See Also

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

https://bugzilla.redhat.com/show_bug.cgi?id=2419455

https://bugzilla.redhat.com/show_bug.cgi?id=2419467

https://bugzilla.redhat.com/show_bug.cgi?id=2427726

https://issues.redhat.com/browse/SAT-41761

http://www.nessus.org/u?24be4d0f

https://access.redhat.com/errata/RHSA-2026:2764

Plugin Details

Severity: High

ID: 299226

File Name: redhat-RHSA-2026-2764.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/16/2026

Updated: 2/16/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2026-21441

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

CVSS v4

Risk Factor: High

Base Score: 8.9

Threat Score: 6.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:python-urllib3, p-cpe:/a:redhat:enterprise_linux:python3.11-urllib3, cpe:/o:redhat:enterprise_linux:9

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: 2/16/2026

Vulnerability Publication Date: 12/5/2025

Reference Information

CVE: CVE-2025-66418, CVE-2025-66471, CVE-2026-21441

CWE: 409, 770

RHSA: 2026:2764