CVE-2026-39888

תיאור (מקור, אנגלית)

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.

מדדים

CVSS 3.1

9.9 (CRITICAL) מקור הציון: NVD CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS — סבירות ניצול

0% (אחוזון 000) נכון ל-28/7/2026

CWE

CWE-657, CWE-693

מוצרים מושפעים

praison: praisonai

קישורים

• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qf73-2hrx-‮… Vendor Advisory