CVE-2026-47392 PraisonAI vulnerable to sandbox escape via `print.__self__` builtins module leak in `execute_code` (subprocess mode)
Attackers can bypass the Python sandbox in PraisonAI to execute arbitrary OS commands on the host by leaking builtins via print.__self__.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47392?
CVE-2026-47392 is a critical code injection vulnerability in MervinPraison < 1.6.40, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
PraisonAI is a multi-agent teams system. Prior to version 4.6.40 of PraisonAI, corresponding to version 1.6.40 of praisonaiagents, `execute_code()` in `praisonaiagents/tools/python_tools.py` (v1.6.37, subprocess sandbox mode) can be fully bypassed using `print.__self__` to retrieve the real Python `builtins` module, from which `__import__` can be extracted via `vars()` and runtime string construction. This achieves arbitrary OS command execution on the host, completely defeating the sandbox. This is a novel bypass that survives all patches for CVE-2026-39888 (frame traversal), CVE-2026-34938 (str subclass), and CVE-2026-40158 (`type.__getattribute__` trampoline). PraisonAI version 4.6.40 and praisonaiagents version 1.6.40 contain an updated fix.
Which versions are affected by CVE-2026-47392?
6 open source packages ship an affected version, including praisonaiagents, PraisonAI and praisonai.
| Package | Affected | Fixed in |
|---|---|---|
praisonaiagents PyPI | All versions | 1.6.40 |
praisonaiagents PyPI | All versions | 1.6.40 |
praisonaiagents PyPI | All versions | 1.6.40 |
PraisonAI PyPI | All versions | 4.6.40 |
praisonai PyPI | All versions | 4.6.40 |
praisonai PyPI | All versions | 4.6.40 |
How do I fix CVE-2026-47392?
Upgrade praisonaiagents to 1.6.40 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-47392 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47392 exists.
Sources
Also known as GHSA-4mr5-g6f9-cfrh, PYSEC-2026-463, PYSEC-2026-483.