CVE-2025-9959

High

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.

SeverityHigh

CVSS7.6

Exploit probability—

ProductSmolagents

PublishedSep 3, 2025

First seenSep 3, 2025

Weakness typeCWE-94Code injection

How to fix

Update

smolagents1.21.0 or later

Patches

github.com/huggingface/smolagents/pull/1551

Affected products

Product	Affected versions	Fixed in
smolagents	v < 1.21.0	1.21.0

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