CVE-2026-34937 PraisonAI: Shell Injection in run_python() via Unescaped $() Substitution
Attackers can execute arbitrary OS commands via shell injection in PraisonAI's run_python function due to insufficient escaping of user-controlled code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34937?
CVE-2026-34937 is a high-severity command injection vulnerability in MervinPraison PraisonAI, published on 3 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
PraisonAI is a multi-agent teams system. Prior to version 1.5.90, run_python() in praisonai constructs a shell command string by interpolating user-controlled code into python3 -c "<code>" and passing it to subprocess.run(..., shell=True). The escaping logic only handles \ and ", leaving $() and backtick substitutions unescaped, allowing arbitrary OS command execution before Python is invoked. This issue has been patched in version 1.5.90.
Weakness: CWE-78
Which versions are affected by CVE-2026-34937?
3 open source packages ship an affected version, including praisonaiagents. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
praisonaiagents PyPI | All versions | 1.5.90 |
praisonaiagents PyPI | All versions | 1.5.90 |
praisonaiagents PyPI | All versions | 1.5.90 |
Products include Praison Praisonaiagents.
How do I fix CVE-2026-34937?
Upgrade praisonaiagents to 1.5.90 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-34937 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34937 exists.
Other vulnerabilities in MervinPraison PraisonAI
- CVE-2026-34938 PraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_code
- CVE-2026-40111 PraisonAIAgents has an OS Command Injection via shell=True in Memory Hooks Executor (memory/hooks.py)
- CVE-2026-34954 PraisonAI: SSRF in FileTools.download_file() via Unvalidated URL
- CVE-2026-44335 SSRF bypass in PraisonAI
- CVE-2026-40150 PraisonAIAgents has SSRF and Local File Read via Unvalidated URLs in web_crawl Tool
Sources
Also known as GHSA-w37c-qqfp-c67f, PYSEC-2026-2954.