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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 Reserved 2026-04-19 | Published 2026-04-20 | Updated 2026-04-20 | Assigner VulDB




MEDIUM: 6.9CVSS: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
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
5.0AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

Resource Consumption

Denial of Service

Product status

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

Timeline

2026-04-19:Advisory disclosed
2026-04-19:VulDB entry created
2026-04-19:VulDB entry last update

Credits

Eric-f (VulDB User) reporter

References

vuldb.com/vuln/358242 (VDB-358242 | lm-sys fastchat Worker API Endpoint api_generate resource consumption) vdb-entry technical-description

vuldb.com/vuln/358242/cti (VDB-358242 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/792227 (Submit #792227 | LM-Sys FastChat <= 0.2.36 Denial of Service (CWE-400)) third-party-advisory

github.com/lm-sys/FastChat/issues/3833 issue-tracking

github.com/lm-sys/FastChat/pull/3835 issue-tracking patch

gist.github.com/YLChen-007/87216a2d97a882d619e11dc67cd473b5 exploit

github.com/...ommit/c9e84b89c91d45191dc24466888de526fa04cf33 patch

github.com/lm-sys/FastChat/ product

cve.org (CVE-2026-6607)

nvd.nist.gov (CVE-2026-6607)

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