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CVE-2025-66418

πŸ”΄ HIGH

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 inse...

Published
Dec 05, 2025
Last Modified
Dec 10, 2025
Views
21
Bookmarks
0

Description

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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.

Affected Products (1)

python - urllib3

Version: *

CVSS Scores

CVSS 3.1 7.5
7.5
HIGH
CVSS 2.0 7.5

References

github.com github.com

Additional Information

Source
security-advisories@github.com
State
Analyzed

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