{"id":86030,"date":"2025-12-13T13:15:52","date_gmt":"2025-12-13T13:15:52","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-9959-python-execution-environment-sandbox-escape-in-smolagents","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9959-python-execution-environment-sandbox-escape-in-smolagents\/","title":{"rendered":"CVE-2025-9959: Python Execution Environment Sandbox Escape in smolagents<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The vulnerability, identified as CVE-2025-9959, is a serious issue that affects the Python execution environment sandbox maintained by smolagents. This is a significant concern as it allows an attacker to escape the sandbox through incomplete validation of dunder attributes, which could potentially lead to system compromise or data leakage.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-9959
\nSeverity: High (7.6 CVSS score)
\nAttack Vector: Local
\nPrivileges Required: Low
\nUser Interaction: Required
\nImpact: Potential system compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

smolagents | All current versions<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit works by taking advantage of the incomplete validation of dunder attributes in the smolagents Python execution environment sandbox. The attacker uses a Prompt Injection to trick the agent into creating malicious code, thereby escaping the sandbox.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

A conceptual example of how this vulnerability might be exploited is shown below. This pseudocode demonstrates how an attacker could use a specially crafted string to trick the agent into running a malicious command:<\/p>\n

# String with embedded prompt injection\nmalicious_string = \"__import__('os').system('malicious_command')\"\n# Trick the agent into executing the malicious string\nagent.execute(malicious_string)<\/code><\/pre>\n
This example shows how the attacker could potentially inject a malicious command into the Python execution environment.<\/p>\n
Mitigation<\/strong><\/p>\n
The recommended mitigation is to apply the vendor patch as soon as it’s available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. It’s crucial to keep these systems up to date and monitor them for any signs of unusual activity.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The vulnerability, identified as CVE-2025-9959, is a serious issue that affects the Python execution environment sandbox maintained by smolagents. This is a significant concern as it allows an attacker to escape the sandbox through incomplete validation of dunder attributes, which could potentially lead to system compromise or data leakage. Vulnerability Summary CVE ID: CVE-2025-9959 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86030","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t