PYSEC-2026-2484

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Import Source

https://github.com/pypa/advisory-database/blob/main/vulns/fschat/PYSEC-2026-2484.yaml

JSON Data

https://api.osv.dev/v1/vulns/PYSEC-2026-2484

Aliases

Published

2026-07-13T15:02:51.980737Z

Modified

2026-07-13T16:32:37.398852409Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
5.5 (Medium) CVSS_V4 - 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 Calculator

Summary

FastChat has Denial of Service Through Blocking Event Loop in Model Workers (Incomplete Fix for ff66426)

Details

A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. This issue affects the function apigenerate 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 apigenerate of basemodelworker.py but missed other entry points.

References

Affected packages

PyPI / fschat

Package

Name: fschat; View open source insights on deps.dev
Purl: pkg:pypi/fschat

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Last affected

0.2.26

Affected versions

0.*

0.1.1

0.1.2

0.1.3

0.1.4

0.1.5

0.1.6

0.1.7

0.1.8

0.1.9

0.1.10

0.2.0

0.2.1

0.2.2

0.2.3

0.2.4

0.2.5

0.2.6

0.2.7

0.2.8

0.2.9

0.2.10

0.2.11

0.2.12

0.2.13

0.2.14

0.2.15

0.2.16

0.2.17

0.2.18

0.2.20

0.2.21

0.2.23

0.2.24

0.2.26

Database specific

source

"https://github.com/pypa/advisory-database/blob/main/vulns/fschat/PYSEC-2026-2484.yaml"