CVE-2026-39888

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-48399 Adobe Campaign Classic (ACC) is affected by a Violation of Secure Design Principles… CWE-657
• CVE-2026-113730 OGNL is an Object Graph Navigation Library for Java. CWE-693
• CVE-2026-112077 A vulnerability was detected in radareorg radare2 6.2.0/6.2.2. CWE-693
• CVE-2026-88838 A flaw was found in BusyBox's mount utility. CWE-693
• CVE-2026-101899 Axios is a promise-based HTTP client for the browser and Node.js. CWE-693
• CVE-2026-107226 The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP… CWE-693
• CVE-2026-107697 FFmpeg before 8.1.3 contains a protection mechanism failure in the HLS demuxer that… CWE-693
• CVE-2026-105083 ImageMagick before 7.1.2-32 and 6.9.13-57 contains a policy bypass vulnerability in… CWE-693