CVE-2025-9959

7.6 highEPSS 0.3%

High (7.6). EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.6 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-31)
CWE: CWE-94
Published: 2025-09-03
Modified: 2026-09-26
Record from: the NVD, synced 2026-10-19

References

https://github.com/huggingface/smolagents/pull/1551
https://research.jfrog.com/vulnerabilities/smolagents-local-python-sandbox-escape-jfsa-2025-001434277/

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