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CVE-2025-9959— Sandbox escape in smolagents Local Python execution environment via dunder attributes

Quick assessment

Affected
CVE-2025-9959
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

smolagents是Hugging Face开源的一个代理的基本库。 smolagents存在代码注入漏洞，该漏洞源于对dunder属性验证不完整，可能导致从Local Python执行环境沙箱逃逸。

CVSS 7.6 · High EPSS 0.31% · P23

I. Basic Information for CVE-2025-9959

Vulnerability Information
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Vulnerability Title
Sandbox escape in smolagents Local Python execution environment via dunder attributes
Source: CVE Program / CVE List V5
Vulnerability Description
Incomplete validation of dunder attributes allows an attacker to escape from the Local Python execution environment sandbox, enforced by smolagents. The attack requires a Prompt Injection in order to trick the agent to create malicious code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
smolagents 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
smolagents是Hugging Face开源的一个代理的基本库。 smolagents存在代码注入漏洞，该漏洞源于对dunder属性验证不完整，可能导致从Local Python执行环境沙箱逃逸。
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)

II. Public POCs for CVE-2025-9959

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8777 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2025-9959

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IV. Related Vulnerabilities

Same weakness: CWE-94

V. Comments for CVE-2025-9959

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