Allocation of Resources Without Limits or Throttling Affecting python-engineio package, versions [,4.13.2)
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Allocation of Resources Without Limits or Throttling vulnerabilities in an interactive lesson.
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.