Detections
Analytics

RockyLinux 9 : python-urllib3 (RLSA-2026:1087)

high Nessus Plugin ID 298632

Synopsis

The remote RockyLinux host is missing one or more security updates.

Description

The remote RockyLinux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RLSA-2026:1087 advisory.

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

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

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

Tenable has extracted the preceding description block directly from the RockyLinux 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-urllib3 package.

See Also

https://errata.rockylinux.org/RLSA-2026:1087

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

Plugin Details

Severity: High

ID: 298632

File Name: rocky_linux_RLSA-2026-1087.nasl

Version: 1.1

Type: local

Published: 2/11/2026

Updated: 2/11/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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:rocky:linux:python-urllib3, cpe:/o:rocky:linux:9, p-cpe:/a:rocky:linux:python3-urllib3

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/11/2026

Vulnerability Publication Date: 12/5/2025

Reference Information

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