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.
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Fri, 05 Dec 2025 21:00:00 +0000
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Fri, 05 Dec 2025 16:15:00 +0000
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| Description | 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. | |
| Title | urllib3 allows an unbounded number of links in the decompression chain | |
| Weaknesses | CWE-770 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-12-05T16:02:15.271Z
Updated: 2025-12-05T18:15:28.505Z
Reserved: 2025-11-28T23:33:56.367Z
Link: CVE-2025-66418
Updated: 2025-12-05T16:15:58.171Z
Status : Received
Published: 2025-12-05T16:15:51.053
Modified: 2025-12-05T16:15:51.053
Link: CVE-2025-66418
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