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SUSE 2026 0635-1 Python-urllib3 Moderate Resource Exhaustion Advisory

suse
Calendar Grey February 25, 2026
Dist Suse Esm H88
Update fixes three resource exhaustion issues in python-urllib3, enhancing security in SUSE systems. Install promptly.
An update that solves three vulnerabilities can now be installed.

Summary

## 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

Topics%20covered

Topics Covered

security advisory moderate SuSE resource exhaustion python-urllib3 excessive consumption

References

* bsc#1254866

* bsc#1254867

* bsc#1256331

Cross-

* 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

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

Topics%20covered

Topics Covered

security advisory moderate SuSE resource exhaustion python-urllib3 excessive consumption

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