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CVE-2026-6608— lm-sys fastchat Arena Side-by-Side View add_text control flow

Quick assessment

Affected
lm-sys fastchat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FastChat是LMSYS开源的一个用于训练、部署和评估基于大型语言模型的聊天机器人的开放平台。 FastChat 0.2.36及之前版本存在安全漏洞，该漏洞源于对组件Arena Side-by-Side View Handler中函数add_text的错误操作，可能导致控制流不正确。

CVSS 5.3 · Medium EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-6608

Vulnerability Information
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Vulnerability Title
lm-sys fastchat Arena Side-by-Side View add_text control flow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
控制流实现总是不正确
Source: CVE Program / CVE List V5
Vulnerability Title
FastChat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastChat是LMSYS开源的一个用于训练、部署和评估基于大型语言模型的聊天机器人的开放平台。 FastChat 0.2.36及之前版本存在安全漏洞，该漏洞源于对组件Arena Side-by-Side View Handler中函数add_text的错误操作，可能导致控制流不正确。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lm-sys fastchat 0.2.0 cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-6608

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III. Intelligence Information for CVE-2026-6608

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Vendor Advisories for CVE-2026-6608 (1)

Proof of Concept for CVE-2026-6608 (1)

Security Blog Posts for CVE-2026-6608 (1)

IV. Related Vulnerabilities

Same product: fastchat
Same vendor: lm-sys
Same weakness: CWE-670

V. Comments for CVE-2026-6608

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