Allocation of Resources Without Limits or Throttling Affecting python2-pip package, versions <0:20.2.2-1.amzn2.0.14


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.03% (8th percentile)

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  • Snyk IDSNYK-AMZN2-PYTHON2PIP-15058253
  • published22 Jan 2026
  • disclosed5 Dec 2025

Introduced: 5 Dec 2025

CVE-2025-66418  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python2-pip to version 0:20.2.2-1.amzn2.0.14 or higher.
This issue was patched in ALAS2-2026-3126.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python2-pip package and not the python2-pip package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1