EUVD-2026-21510
GHSA-3c4r-6p77-xwr7
Severity by source
AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionGitHub Advisory
PraisonAI is a multi-agent teams system. Prior to 4.5.128, PraisonAI's AST-based Python sandbox can be bypassed using type.__getattribute__ trampoline, allowing arbitrary code execution when running untrusted agent code. The _execute_code_direct function in praisonaiagents/tools/python_tools.py uses AST filtering to block dangerous Python attributes like __subclasses__, __globals__, and __bases__. However, the filter only checks ast.Attribute nodes, allowing a bypass. The sandbox relies on AST-based filtering of attribute access but fails to account for dynamic attribute resolution via built-in methods such as type.getattribute, resulting in incomplete enforcement of security restrictions. The string '__subclasses__' is an ast.Constant, not an ast.Attribute, so it is never checked against the blocked list. This vulnerability is fixed in 4.5.128.
AnalysisAI
Arbitrary code execution in PraisonAI multi-agent system (<4.5.128) via Python sandbox escape. Incomplete AST attribute filtering allows type.__getattribute__ trampoline to bypass restrictions on __subclasses__, __globals__, and __bases__, enabling untrusted agent code to break containment. Attack requires local access and user interaction to execute malicious code. No public exploit identified at time of analysis.
Technical ContextAI
AST-based sandbox in _execute_code_direct function only validates ast.Attribute nodes against blocklist, missing ast.Constant string literals. Attackers invoke type.__getattribute__('__subclasses__') where '__subclasses__' parses as Constant, evading detection and accessing Python introspection primitives for arbitrary code execution via CWE-94 code injection.
RemediationAI
Vendor-released patch: upgrade to PraisonAI version 4.5.128 or later, which addresses the AST filtering bypass. Immediate action: users running multi-agent systems with untrusted code execution must upgrade to eliminate sandbox escape risk. Workaround: restrict execution of untrusted agent code in production environments, enforce strict code review, and isolate agent runtime in containerized sandboxes with restricted syscall policies until patching is complete. Advisory: https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-3c4r-6p77-xwr7
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External POC / Exploit Code
Leaving vuln.today