CVE-2026-34935 PraisonAI: OS Command Injection in MCPHandler.parse_mcp_command()
Attackers can execute arbitrary OS commands via the --mcp CLI argument in PraisonAI due to lack of input validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34935?
CVE-2026-34935 is a critical command injection vulnerability in MervinPraison PraisonAI, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PraisonAI is a multi-agent teams system. From version 4.5.15 to before version 4.5.69, the --mcp CLI argument is passed directly to shlex.split() and forwarded through the call chain to anyio.open_process() with no validation, allowlist check, or sanitization at any hop, allowing arbitrary OS command execution as the process user. This issue has been patched in version 4.5.69.
Weakness: CWE-78
Which versions are affected by CVE-2026-34935?
3 open source packages ship an affected version, including praisonai. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | From 4.5.15 | 4.5.69 |
praisonai PyPI | From 4.5.15 | 4.5.69 |
praisonai PyPI | From 4.5.15 | 4.5.69 |
Products include Praison Praisonai.
How do I fix CVE-2026-34935?
Upgrade praisonai to 4.5.69 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-34935 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34935 exists.
Other vulnerabilities in MervinPraison PraisonAI
- CVE-2026-39888 PraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subprocess mode)
- CVE-2026-41497 Incomplete fix for CVE-2026-34935: Command Injection in MervinPraison/PraisonAI
- CVE-2026-40288 PraisonAI: Critical RCE via `type: job` workflow YAML
- CVE-2026-39890 PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading
- CVE-2026-34934 PraisonAI: Second-Order SQL Injection in `get_all_user_threads`
Sources
Also known as GHSA-9gm9-c8mq-vq7m, PYSEC-2026-471.