SUSE-SU-2026:0635-1: moderate: Security update for python-urllib3_1

[SLE-SECURITY-UPDATES]

# Security update for python-urllib3_1

Announcement ID: SUSE-SU-2026:0635-1  
Release Date: 2026-02-25T11:12:56Z  
Rating: moderate  
References:

  * bsc#1254866
  * bsc#1254867
  * bsc#1256331

  
Cross-References:

  * CVE-2025-66418
  * CVE-2025-66471
  * CVE-2026-21441

  
CVSS scores:

  * CVE-2025-66418 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-66418 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2025-66418 ( NVD ):  8.9
    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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2025-66418 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2025-66471 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2025-66471 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2025-66471 ( NVD ):  8.9
    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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2025-66471 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-21441 ( SUSE ):  2.3
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-21441 ( SUSE ):  4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
  * CVE-2026-21441 ( NVD ):  8.9
    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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-21441 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * openSUSE Leap 15.6
  * Python 3 Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for python-urllib3_1 fixes the following issues:

  * CVE-2025-66471: excessive resource consumption via decompression of highly
    compressed data in Streaming API (bsc#1254867).
  * CVE-2025-66418: resource exhaustion via unbounded number of links in the
    decompression chain (bsc#1254866).
  * CVE-2026-21441: excessive resource consumption during decompression of data
    in HTTP redirect responses (bsc#1256331).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * openSUSE Leap 15.6  
    zypper in -t patch openSUSE-SLE-15.6-2026-635=1 SUSE-2026-635=1

  * Python 3 Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Python3-15-SP7-2026-635=1

## Package List:

  * openSUSE Leap 15.6 (noarch)
    * python311-urllib3_1-1.26.18-150600.3.6.1
  * Python 3 Module 15-SP7 (noarch)
    * python311-urllib3_1-1.26.18-150600.3.6.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-66418.html
  * https://www.suse.com/security/cve/CVE-2025-66471.html
  * https://www.suse.com/security/cve/CVE-2026-21441.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1254866
  * https://bugzilla.suse.com/show_bug.cgi?id=1254867
  * https://bugzilla.suse.com/show_bug.cgi?id=1256331

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