Vulnerable Library - urllib3-1.26.6-py2.py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/5f/64/43575537846896abac0b15c3e5ac678d787a4021e906703f1766bfb8ea11/urllib3-1.26.6-py2.py3-none-any.whl

Path to dependency file: /etc/pip/evgtest-requirements.txt

Path to vulnerable library: /etc/pip/evgtest-requirements.txt,/etc/pip/lint-requirements.txt,/etc/pip/dev-requirements.txt,/etc/pip/jira-requirements.txt,/etc/pip/core-requirements.txt,/etc/pip/dev-requirements.txt,/etc/pip/toolchain-requirements.txt,/etc/pip/powercycle-requirements.txt,/etc/pip/evgtest-requirements.txt,/src/third_party/wiredtiger/bench/workgen,/etc/pip/toolchain-requirements.txt,/etc/pip/compile-requirements.txt,/etc/pip/powercycle-requirements.txt

Dependency Hierarchy:

• ❌ urllib3-1.26.6-py2.py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 60ef70ebd8d46f4c893b3fb90ccf2616f8e21d2b

Found in base branch: master

Vulnerability Details

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.

Publish Date: 2025-12-05

URL: CVE-2025-66471

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

Suggested Fix

Type: Upgrade version

Origin: GHSA-2xpw-w6gg-jr37

Release Date: 2025-12-05

Fix Resolution: urllib3 - 2.6.0,https://github.com/urllib3/urllib3.git - 2.6.0