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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

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

No data.

No data.

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Vendors Products
Lm-sys Subscribe
Fastchat Subscribe

Project Subscriptions

Vendors Products
Lm-sys Subscribe
Fastchat Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://gist.github.com/YLChen-007/87216a2d97a882d619e11dc67cd473b5 cve-icon cve-icon
https://github.com/lm-sys/FastChat/ cve-icon cve-icon
https://github.com/lm-sys/FastChat/commit/c9e84b89c91d45191dc24466888de526fa04cf33 cve-icon cve-icon
https://github.com/lm-sys/FastChat/issues/3833 cve-icon cve-icon
https://github.com/lm-sys/FastChat/pull/3835 cve-icon cve-icon
https://vuldb.com/submit/792227 cve-icon cve-icon
https://vuldb.com/vuln/358242 cve-icon cve-icon
https://vuldb.com/vuln/358242/cti cve-icon cve-icon
History

Mon, 20 Apr 2026 05:15:00 +0000

Type Values Removed Values Added
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.
Title lm-sys fastchat Worker API Endpoint api_generate resource consumption
First Time appeared Lm-sys
Lm-sys fastchat
Weaknesses CWE-400
CWE-404
CPEs cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:*
Vendors & Products Lm-sys
Lm-sys fastchat
References
Metrics cvssV2_0

{'score': 5, 'vector': 'AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 5.3, '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'}

cvssV3_1

{'score': 5.3, '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'}

cvssV4_0

{'score': 6.9, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-04-20T05:00:23.135Z

Reserved: 2026-04-19T15:59:39.594Z

Link: CVE-2026-6607

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-20T05:16:16.190

Modified: 2026-04-20T05:16:16.190

Link: CVE-2026-6607

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-20T06:30:45Z

Weaknesses