CVE-2026-6607CWE-400CWE-404

lm-sys fastchat Worker API Endpoint api_generate resource consumption

Medium · published April 20, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
54.1
In the wild
Unconfirmed
What it is

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 and did miss other entry points.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00741 · 54.1th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-404 · Improper Resource Shutdown or Release
Published
2026-04-20T05:00Z
EPSS history
Timeline
  • 20 APR 05:00Z
    lm-sys fastchat Worker API Endpoint api_generate resource consumption
    cvelistv5