lm-sys fastchat Worker API Endpoint api_generate resource consumption_CVE-2026-6607

6.9 / 10

MEDIUM

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

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 and did miss other entry points.

Basic Information

ID CVE-2026-6607

Source VulDB

Published Apr 20, 2026 at 05:00

Affected Product

Vendor lm-sys

Product fastchat

Version 0.2.0

Affected Versions lm-sys fastchat 0.2.0
lm-sys fastchat 0.2.1
lm-sys fastchat 0.2.2
lm-sys fastchat 0.2.3
lm-sys fastchat 0.2.4
lm-sys fastchat 0.2.5
lm-sys fastchat 0.2.6
lm-sys fastchat 0.2.7
lm-sys fastchat 0.2.8
lm-sys fastchat 0.2.9
lm-sys fastchat 0.2.10
lm-sys fastchat 0.2.11
lm-sys fastchat 0.2.12
lm-sys fastchat 0.2.13
lm-sys fastchat 0.2.14
lm-sys fastchat 0.2.15
lm-sys fastchat 0.2.16
lm-sys fastchat 0.2.17
lm-sys fastchat 0.2.18
lm-sys fastchat 0.2.19
lm-sys fastchat 0.2.20
lm-sys fastchat 0.2.21
lm-sys fastchat 0.2.22
lm-sys fastchat 0.2.23
lm-sys fastchat 0.2.24
lm-sys fastchat 0.2.25
lm-sys fastchat 0.2.26
lm-sys fastchat 0.2.27
lm-sys fastchat 0.2.28
lm-sys fastchat 0.2.29
lm-sys fastchat 0.2.30
lm-sys fastchat 0.2.31
lm-sys fastchat 0.2.32
lm-sys fastchat 0.2.33
lm-sys fastchat 0.2.34
lm-sys fastchat 0.2.35
lm-sys fastchat 0.2.36

CWE Classification

CWE-400 CWE-404

References

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    "lastseen": "",
    "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 and did miss other entry points.",
    "published": "2026-04-20T05:00:23.135Z",
    "modified": "2026-04-20T05:00:23.135Z",
    "type": "cve",
    "title": "lm-sys fastchat Worker API Endpoint api_generate resource consumption",
    "source": "VulDB",
    "references": "https://vuldb.com/vuln/358242\nhttps://vuldb.com/vuln/358242/cti\nhttps://vuldb.com/submit/792227\nhttps://github.com/lm-sys/FastChat/issues/3833\nhttps://github.com/lm-sys/FastChat/pull/3835\nhttps://gist.github.com/YLChen-007/87216a2d97a882d619e11dc67cd473b5\nhttps://github.com/lm-sys/FastChat/commit/c9e84b89c91d45191dc24466888de526fa04cf33\nhttps://github.com/lm-sys/FastChat/",
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