CVE-2026-39888
CriticalCVSS 9.9Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
PraisonAI prior to version 1.5.115 has a vulnerability in the execute_code() function in sandbox mode. The AST blocklist in the subprocess is incomplete, allowing sandbox escape and arbitrary Python code execution.
Risk Assessment
An attacker can escape the sandbox and execute arbitrary Python code on the server, leading to full system compromise.
Recommendation
Upgrade PraisonAI to version 1.5.115 or later.
Original NVD description (English source)
PraisonAI is a multi-agent teams system. Prior to 1.5.115, execute_code() in praisonaiagents.tools.python_tools defaults to sandbox_mode="sandbox", which runs user code in a subprocess wrapped with a restricted __builtins__ dict and an AST-based blocklist. The AST blocklist embedded inside the subprocess wrapper (blocked_attrs of python_tools.py) contains only 11 attribute names — a strict subset of the 30+ names blocked in the direct-execution path. The four attributes that form a frame-traversal chain out of the sandbox are all absent from the subprocess list (__traceback__, tb_frame, f_back, and f_builtins). Chaining these attributes through a caught exception exposes the real Python builtins dict of the subprocess wrapper frame, from which exec can be retrieved and called under a non-blocked variable name — bypassing every remaining security layer. This vulnerability is fixed in 1.5.115.