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Security Advisories

CVE-2025-66418

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-66418

Severity

Unknown
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Summary

urllib3 allows an unbounded number of links in the decompression chain

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.

References

Affected packages


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