CVE-2026-6607 PUBLISHED

lm-sys fastchat Worker API Endpoint api_generate resource consumption

Assigner: VulDB
Reserved: 19.04.2026 Published: 20.04.2026 Updated: 20.04.2026

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.

CVSS 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.0

CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C
CVSS Score: 5

Access Vector	Network	Confidentiality Impact	None
Access Complexity	Low	Integrity Impact	None
Authentication	None	Availability Impact	Partial

CVSS 2.0

Product Status

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

CVE-2026-6607 PUBLISHED

lm-sys fastchat Worker API Endpoint api_generate resource consumption

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