lm-sys fastchat Arena Side-by-Side View add_text control flow_CVE-2026-6608

6.9 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Description

A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed.

Basic Information

ID CVE-2026-6608

Source VulDB

Published Apr 20, 2026 at 05:15

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-670

References

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    "description": "A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed.",
    "published": "2026-04-20T05:15:12.337Z",
    "modified": "2026-04-20T05:15:12.337Z",
    "type": "cve",
    "title": "lm-sys fastchat Arena Side-by-Side View add_text control flow",
    "source": "VulDB",
    "references": "https://vuldb.com/vuln/358243\nhttps://vuldb.com/vuln/358243/cti\nhttps://vuldb.com/submit/792228\nhttps://github.com/lm-sys/FastChat/issues/3834\nhttps://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36\nhttps://github.com/lm-sys/FastChat/",
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