CVE-2025-3677— lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization
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及之前版本存在代码问题漏洞，该漏洞源于fastchat/model/apply_delta.py文件split_files/apply_delta_low_cpu_mem函数反序列化问题。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2025-3677
Vulnerability Information
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Vulnerability Title
lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability classified as critical was found in lm-sys fastchat up to 0.2.36. This vulnerability affects the function split_files/apply_delta_low_cpu_mem of the file fastchat/model/apply_delta.py. The manipulation leads to deserialization. An attack has to be approached locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
FastChat 代码问题漏洞
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及之前版本存在代码问题漏洞，该漏洞源于fastchat/model/apply_delta.py文件split_files/apply_delta_low_cpu_mem函数反序列化问题。
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
II. Public POCs for CVE-2025-3677
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Vendor Advisories for CVE-2025-3677 (3)
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Submit #552755: lm-sys FastChat v0.2.3 to v0.2.36 Deserialization third-party-advisory
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CVE-2025-3677 lm-sys fastchat apply_delta.py apply_delta_low_cpu_mem deserialization (Issue 3713) vdb-entry technical-description
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