Security update for python-urllib3 SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2026:20175-1 Final 1 1 2026-01-28T16:03:29Z current 2026-01-28T16:03:29Z 2026-01-28T16:03:29Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for python-urllib3 This update for python-urllib3 fixes the following issues: - CVE-2025-66471: Fixed excessive resource consumption via decompression of highly compressed data in Streaming API (bsc#1254867) - CVE-2025-66418: Fixed resource exhaustion via unbounded number of links in the decompression chain (bsc#1254866) The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-SL-Micro-6.2-212 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2026/suse-su-202620175-1/ Link for SUSE-SU-2026:20175-1 https://lists.suse.com/pipermail/sle-security-updates/2026-February/024008.html E-Mail link for SUSE-SU-2026:20175-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1254866 SUSE Bug 1254866 https://bugzilla.suse.com/1254867 SUSE Bug 1254867 https://www.suse.com/security/cve/CVE-2025-66418/ SUSE CVE CVE-2025-66418 page https://www.suse.com/security/cve/CVE-2025-66471/ SUSE CVE CVE-2025-66471 page SUSE Linux Micro 6.2 python313-urllib3-2.5.0-160000.4.1 python313-urllib3-2.5.0-160000.4.1 as a component of SUSE Linux Micro 6.2 urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0. CVE-2025-66418 SUSE Linux Micro 6.2:python313-urllib3-2.5.0-160000.4.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620175-1/ https://www.suse.com/security/cve/CVE-2025-66418.html CVE-2025-66418 https://bugzilla.suse.com/1254866 SUSE Bug 1254866 urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data. CVE-2025-66471 SUSE Linux Micro 6.2:python313-urllib3-2.5.0-160000.4.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-202620175-1/ https://www.suse.com/security/cve/CVE-2025-66471.html CVE-2025-66471 https://bugzilla.suse.com/1254867 SUSE Bug 1254867