High
PraisonAI has Improper Control of Generation of Code ('Code Injection') and Protection Mechanism Failure in praisonai
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-40158
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 01:19 UTC · Revision 1
Source evidence
PraisonAI has Improper Control of Generation of Code ('Code Injection') and Protection Mechanism Failure in praisonai
core-osv · Original sourcePublished 10 Apr 2026, 16:49 UTC
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.
osv:CVE-2026-40158
Complete source record
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"id": "2d1c2470735e8c07bb38b4adb207eb8c4ae10b5c207450d5d5348450708c0fde",
"url": "https://osv.dev/vulnerability/CVE-2026-40158",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "PraisonAI has Improper Control of Generation of Code ('Code Injection') and Protection Mechanism Failure in praisonai",
"summary": "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.",
"evidence": "osv:CVE-2026-40158",
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"modified": "2026-10-28T02:30:41.595630601Z",
"provider": "osv",
"references": [
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