Decompression Bomb Affecting urllib3 package, versions [2.6.0,2.7.0)
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-URLLIB3-16642059
- published12 May 2026
- disclosed11 May 2026
- creditKarim Foughali
Introduced: 11 May 2026
CVE-2026-44432 (opens in a new tab)How to fix?
Upgrade urllib3 to version 2.7.0 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 Decompression Bomb either in HTTPResponse.read() when Brotli is in use, or when HTTPResponse.drain_conn() is called after partial decompression has begun. An attacker can cause excessive resource consumption on the client by sending a highly compressed response that, when decompressed, results in high CPU usage and large memory allocation.
Workaround
This vulnerability can be avoided for the Brotli dependency by switching to brotlicffi.