Infinite loop Affecting urllib3 package, versions [2.6.2,2.8.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-URLLIB3-20302845
- published30 Sept 2026
- disclosed29 Sept 2026
- creditMartin Desrumaux, Illia Volochii
Introduced: 29 Sep 2026
NewCVE-2026-97688 (opens in a new tab)How to fix?
Upgrade urllib3 to version 2.8.0 or higher.
Overview
urllib3 is a HTTP library with thread-safe connection pooling, file post, and more.
Affected versions of this package are vulnerable to Infinite loop via the DeflateDecoder.decompress method in src/urllib3/response.py, where a Deflate-encoded HTTP response that signals EOF can cause the decoder to enter an infinite loop. An attacker serving a malicious response can trigger this condition, causing the client process to hang indefinitely and resulting in a crash of the affected service.