Allocation of Resources Without Limits or Throttling Affecting urllib3 package, versions [1.10.3,2.8.0)
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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Start learning- Snyk IDSNYK-PYTHON-URLLIB3-20302846
- published30 Sept 2026
- disclosed29 Sept 2026
- creditQuentin Pradet, Illia Volochii
Introduced: 29 Sep 2026
NewCVE-2026-97689 (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 Allocation of Resources Without Limits or Throttling via HTTPResponse._update_chunk_length() in response.py, where the chunk-size line in a chunked transfer-encoded response is read with an unbounded readline() call. A malicious server can send a Transfer-Encoding: chunked response followed by an unterminated chunk-size line of arbitrary length, forcing the client to buffer the entire run in memory before the read can be rejected, causing memory exhaustion.
Note: This is only exploitable when the client connects to a malicious or compromised server, and applies only to the chunk-size line read, not to chunk body data.