Allocation of Resources Without Limits or Throttling in Python Engine.IO - #VU132252
Published: May 25, 2026
Vulnerability identifier: #VU132252
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Miguel Grinberg
Affected software:
Python Engine.IO
Python Engine.IO
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the heartbeat mechanism when handling new connections and PONG packets. A remote attacker can send connection attempts and crafted PONG packets to cause a denial of service.
This issue primarily affects synchronous servers, while asynchronous servers allocate background tasks instead of physical threads.
Remediation
Install security update from vendor's website.