Detections
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RHEL 8 / 9 : Satellite 6.16.6.1 Async Update (Important) (RHSA-2026:2765)

high Nessus Plugin ID 299271

Synopsis

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

Description

The remote Redhat Enterprise Linux 8 / 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:2765 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.

 Bug Fix(es):

 * Clean duplicate erratum packages before bigint migration (6.16) (SAT-41984)

 Security Fix(es):

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

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

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

 Users of Red Hat Satellite are advised to upgrade to these updated packages, which fix these bugs.

 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 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-41984

http://www.nessus.org/u?62923bc3

https://access.redhat.com/errata/RHSA-2026:2765

Plugin Details

Severity: High

ID: 299271

File Name: redhat-RHSA-2026-2765.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/17/2026

Updated: 2/17/2026

Supported Sensors: Continuous Assessment, 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, cpe:/o:redhat:enterprise_linux:8, 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: 2026:2765