PT-2026-59654 · Pypi · Python-Engineio

Publicado 2026-07-13 · Atualizado 2026-07-13

OSV

CVSS v3.1

7.5

Alta

Vetor base

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact

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 is received, and when the client sends a PONG packet.

Note: this issue primarily affects synchronous servers. Asynchronous servers allocate background tasks instead of physical threads, which are lightweight and less likely to cause denial of service. However, the fix that was implemented was also applied to the asynchronous case.

Patches

Version 4.13.2 addresses this issue as follows:

• The initial background thread (or async task( for heartbeat management is only launched if a client passes authentication in the connect handler.
• The server now ensures that there is only one background heatbeat thread (or async task) per client at a given point in time. Out of sequence PONG packets are now discarded when an active heartbeat thread is already running.

Correção

Identificadores relacionados

PYSEC-2026-3032

Produtos afetados

Python-Engineio

Referências · 6

• https://github.com/miguelgrinberg/python-engineio · Nota
• https://github.com/miguelgrinberg/python-engineio/security/advisories/GHSA-cgwc-pv48-fhj5 · Nota
• https://github.com/advisories/GHSA-cgwc-pv48-fhj5 · Nota
• https://osv.dev/vulnerability/PYSEC-2026-3032 · Aviso do Fabricante
• https://pypi.org/project/python-engineio · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-48802 · Nota de Segurança