PraisonAI Vulnerable to Code Injection and Protection Mechanism Failure

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.6 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS

• CVE-2026-40158: 0.24% estimated exploitation activity in the next 30 days; percentile 15.20 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

PraisonAI's AST-based Python sandbox can be bypassed using type.getattribute trampoline, allowing arbitrary code execution when running untrusted agent code. Description The executecodedirect function in praisonaiagents/tools/pythontools.py uses AST filtering to block dangerous Python attributes like subclasses, globals, and bases. However, the filter only checks ast.Attribute nodes, allowing bypass via: 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. Proof of Concept --- Impact This vulnerability allows attackers to escape the intended Python sandbox and execute arbitrary code with the privileges of the host process. An attacker can: Access sensitive data such as environment variables, API keys,…

Published by the source

10 Apr 2026, 19:25 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:40 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-3c4r-6p77-xwr7

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-3c4r-6p77-xwr7

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# Patch Next advisory brief: CVE-2026-40158

Advisory: PraisonAI Vulnerable to Code Injection and Protection Mechanism Failure
IDs: CVE-2026-40158, GHSA-3c4r-6p77-xwr7
Record: https://patchnext.com/advisories/cve-2026-40158 (revision 2, source checked 26 Oct 2026, 13:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: praisonai 4.5.128. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI praisonai: affected < 4.5.128; fixed in 4.5.128

## Suggested inspection (read-only)
- `python -m pip show praisonai`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on praisonai.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-3c4r-6p77-xwr7 (OSV record GHSA-3c4r-6p77-xwr7 lists affected ranges: PyPI praisonai >=0 <4.5.128 (fixed))
- Verified: https://github.com/advisories/GHSA-3c4r-6p77-xwr7 (GitHub-reviewed advisory GHSA-3c4r-6p77-xwr7 lists affected ranges: PyPI praisonai >=0 <4.5.128)

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