CVE-2026-48802

A flaw was found in python-engineio, a Python implementation of the Engine.IO realtime client and server. A remote attacker can exploit a vulnerability in the heartbeat mechanism by sending specific packets, leading to the creation of excessive background threads. This can result in a Denial of...

CVE-2026-48802

python-engineio is a Python implementation of the Engine.IO realtime client and server. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection ...

CVE-2026-48802

Summary (CVE-2026-48802, python-engineio): Before v4.13.2, a heartbeat-driven background thread could be created on new connections or PONG handling, causing DoS especially on synchronous servers. The fix in v4.13.2 changes the behavior so that the initial heartbeat background thread/async task i...

CVE-2026-48802: Allocation of Resources Without Limits or Throttling

python-engineio is a Python implementation of the Engine.IO realtime client and server. Prior to version 4.13.2, an attacker can cause the creation of unnecessary background threads in the python-engineio server by exploiting the heartbeat mechanism, which launches a thread when a new connection ...