Allocation of Resources Without Limits or Throttling Affecting python-engineio package, versions [,4.13.2)
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-PYTHONENGINEIO-17660885
- published28 Jun 2026
- disclosed26 Jun 2026
- creditUnknown
Introduced: 26 Jun 2026
CVE-2026-48809 (opens in a new tab)How to fix?
Upgrade python-engineio to version 4.13.2 or higher.
Overview
python-engineio is a Python implementation of the Engine.IO realtime client and server.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the handling of incoming messages when using ASGI with the long polling transport for POST requests or Aiohttp with the WebSocket transport. An attacker can exhaust system memory by sending large payloads that are not properly checked for size before being loaded into memory. This is only exploitable if the server is configured to use ASGI with long polling or Aiohttp with WebSocket transport.