Arbitrary Code Injection Affecting smolagents package, versions [,1.21.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-SMOLAGENTS-12549208
- published7 Sept 2025
- disclosed3 Sept 2025
- creditUnknown
Introduced: 3 Sep 2025
NewCVE-2025-9959 (opens in a new tab)How to fix?
Upgrade smolagents to version 1.21.0 or higher.
Overview
smolagents is a 🤗 smolagents: a barebones library for agents. Agents write python code to call tools or orchestrate other agents.
Affected versions of this package are vulnerable to Arbitrary Code Injection due to incomplete validation of dunder attributes, that allows an attacker to escape from the Local Python execution environment sandbox. The attack requires a Prompt Injection in order to trick the agent to create malicious code.