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I. Basic Information for CVE-2025-66418
Vulnerability Information

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Vulnerability Title
urllib3 allows an unbounded number of links in the decompression chain
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
urllib3 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
urllib3是urllib3开源的一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 1.24版本至2.6.0之前版本存在安全漏洞,该漏洞源于解压链中的链接数量无限制,可能导致高CPU使用率和大量内存分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
urllib3urllib3 >= 1.24, < 2.6.0 -
II. Public POCs for CVE-2025-66418
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III. Intelligence Information for CVE-2025-66418
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IV. Related Vulnerabilities
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