PT-2026-31995 · Praisonai · Praisonai

Published 2026-04-10 · Updated 2026-06-01 · CVE-2026-40158

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions PraisonAI versions prior to 4.5.128

Description PraisonAI's AST-based Python sandbox can be bypassed using the type. getattribute trampoline, leading to 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, but the filter only checks ast.Attribute nodes. This allows a bypass because the sandbox does not account for dynamic attribute resolution via 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.

Recommendations Update to version 4.5.128 or later.

Fix

Code Injection

Protection Mechanism Failure

Weakness Enumeration

CWE-94

CWE-693

Related Identifiers

CVE-2026-40158

GHSA-3C4R-6P77-XWR7

Affected Products

Praisonai

References · 8

• https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-3c4r-6p77-xwr7 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-3c4r-6p77-xwr7 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40158 · Security Note
• https://github.com/MervinPraison/PraisonAI · Note
• https://github.com/MervinPraison/PraisonAI/releases/tag/v4.5.128 · Note
• https://twitter.com/CVEnew/status/2042710224138637475 · Twitter Post
• https://laautopsia.com/vulnerabilidad/praisonai-vulnerable-escape-sandbox-via-leak-modulo-builtins · Reddit Post
• https://twitter.com/CveFindCom/status/2042659882822693044 · Twitter Post