CyberRota Analysis
AI-GeneratedThe vulnerability affects versions of urllib3 from 2.6.2 to 2.8.0, allowing an infinite loop in HTTPResponse.stream and HTTPResponse.read_chunked when processing chunked Deflate responses from untrusted servers. This can lead to excessive CPU usage and unresponsive requests, particularly when the response includes trailing bytes after the Deflate stream. Organizations using affected versions of urllib3 should prioritize upgrading to version 2.8.0 to mitigate potential denial-of-service conditions.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
urllib3 is an HTTP client library for Python. From 2.6.2 until 2.8.0, HTTPResponse.stream and HTTPResponse.read_chunked can enter an infinite loop because the Deflate decoder retains trailing bytes as unconsumed input after reaching end-of-stream and repeatedly decodes them without progress. The issue occurs when an untrusted server sends a chunked Deflate response whose decoded body exceeds a positive finite chunk size and whose encoded body has trailing bytes, specifically a response with Transfer-Encoding: chunked and Content-Encoding: deflate, content decoding enabled, and the positive finite amt=N streaming chunk size. The attack mechanism is that a malicious server returns a compressed chunked response with trailing bytes after the Deflate stream. The impact is excessive CPU usage and a request that does not complete, and network read timeouts do not interrupt the loop because no further socket read occurs. This issue is fixed in version 2.8.0.
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