PT-2026-31995 · Mervinpraison · Praisonai

Published 2026-04-10 · Updated 2026-04-10 · CVE-2026-40158

Mitre

CVSS v3.1

8.6

High

AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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.

Fix

Code Injection

Protection Mechanism Failure

Weakness Enumeration

CWE-94

CWE-693

Related Identifiers

CVE-2026-40158

Affected Products

Praisonai

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-40158 · Security Note
• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-3c4r-6p77-xwr7 · Note