An update for python-urllib3 is now available for openEuler-20.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-1251 Final 1.0 1.0 2026-01-30 Initial 2026-01-30 2026-01-30 openEuler SA Tool V1.0 2026-01-30 python-urllib3 security update An update for python-urllib3 is now available for openEuler-20.03-LTS-SP4 HTTP library with thread-safe connection pooling, file post support, sanity friendly, and more. Security Fix(es): 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) 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) An update for python-urllib3 is now available for openEuler-20.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High python-urllib3 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1251 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-66418 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-66471 https://nvd.nist.gov/vuln/detail/CVE-2025-66418 https://nvd.nist.gov/vuln/detail/CVE-2025-66471 openEuler-20.03-LTS-SP4 python-urllib3-1.25.9-14.oe2003sp4.src.rpm python2-urllib3-1.25.9-14.oe2003sp4.noarch.rpm python3-urllib3-1.25.9-14.oe2003sp4.noarch.rpm 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. 2026-01-30 CVE-2025-66418 openEuler-20.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H python-urllib3 security update 2026-01-30 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1251 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. 2026-01-30 CVE-2025-66471 openEuler-20.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H python-urllib3 security update 2026-01-30 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1251