CVE-2026-39888

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.

• CWE-657
• CWE-693

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

Published

Apr 8, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-39881Vim is an open source, command line text editor. Prior to 9.…7.8
• CVE-2026-39882OpenTelemetry-Go is the Go implementation of OpenTelemetry. …5.3
• CVE-2026-39883OpenTelemetry-Go is the Go implementation of OpenTelemetry. …7
• CVE-2026-39884mcp-server-kubernetes is a Model Context Protocol server for…8.1
• CVE-2026-39885FrontMCP is a TypeScript-first framework for the Model Conte…7.5
• CVE-2026-39886OpenEXR provides the specification and reference implementat…5.3
• CVE-2026-39889PraisonAI is a multi-agent teams system. Prior to 4.5.115, t…7.5
• CVE-2026-3989SGLangs `replay_request_dump.py` contains an insecure pickle…7.8
• CVE-2026-39890PraisonAI is a multi-agent teams system. Prior to 4.5.115, t…9.8
• CVE-2026-39891PraisonAI is a multi-agent teams system. Prior to 4.5.115, t…8.8
• CVE-2026-39892cryptography is a package designed to expose cryptographic p…9.8
• CVE-2026-39893Cacti is an open source performance and fault management fra…9.8