CVE-2025-66418 is a high-severity vulnerability affecting Python's urllib3 library, a popular HTTP client. This vulnerability allows a malicious server to exploit the library by inserting a virtually unlimited number of compression steps into the decompression chain. This can lead to high CPU usage and massive memory allocation for the decompressed data, which can severely impact system performance.
The vulnerability has a CVSS score of 8.9, indicating a high level of risk. Organizations utilizing versions of urllib3 from 1.24 to prior to 2.6.0 are at risk and should prioritize remediation. The exploitability of this vulnerability is high, and it necessitates immediate attention from security teams.
Given the nature of this vulnerability, organizations are urged to implement patches as soon as possible. The fixed version is 2.6.0, and failure to upgrade could leave systems vulnerable to performance degradation due to resource exhaustion.
Organizations should prioritize patching immediately.
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