GitHub Advisoryadvisory · PyPI

GHSA-5h65-jx66-j7p5 FastChat has Denial of Service Through Blocking Event Loop in Model Workers (Incomplete Fix for ff66426)

MEDIUM Published 2026-04-20 Modified 2026-04-23 Official page ↗
Aliases
CVE-2026-6607
Ecosystem
PyPI
Packages
fschat
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-400
Reviewed
2026-04-23

Affected packages

• PyPI fschat: <= 0.2.26 (no fix yet)

Description

A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. This issue affects the function api_generate of the component Worker API Endpoint. The manipulation leads to resource consumption. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is c9e84b89c91d45191dc24466888de526fa04cf33. It is suggested to install a patch to address this issue. Commit ff66426 patched this issue in api_generate of base_model_worker.py but missed other entry points.

Related

Alias · CVE (1)

  • CVE-2026-6607 A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. vulnerability

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References