CVE-2026-40088 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in praisonai
Attackers can execute arbitrary shell commands via user-controlled inputs in PraisonAI agent workflows and tool calls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-40088?
CVE-2026-40088 is a critical command injection vulnerability in MervinPraison PraisonAI, published on 9 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
PraisonAI is a multi-agent teams system. Prior to 4.5.121, the execute_command function and workflow shell execution are exposed to user-controlled input via agent workflows, YAML definitions, and LLM-generated tool calls, allowing attackers to inject arbitrary shell commands through shell metacharacters. This vulnerability is fixed in 4.5.121.
Weakness: CWE-78
Which versions are affected by CVE-2026-40088?
4 open source packages ship an affected version, including praisonai and PraisonAI. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | All versions | 4.5.121 |
praisonai PyPI | All versions | 4.5.121 |
praisonai PyPI | All versions | 4.5.121 |
PraisonAI PyPI | All versions | 4.5.121 |
Products include Praison Praisonai.
How do I fix CVE-2026-40088?
Upgrade praisonai to 4.5.121 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-40088 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40088 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-2763-cj5r-c79m, PYSEC-2026-461.