PraisonAI: OS Command Injection in MCPHandler.parse_mcp_command()
Priority HIGH 82CWE-78Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-78.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00839 58th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed PraisonAI (MervinPraison): 4.5.69praisonai (PyPI): 4.5.69
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MervinPraison | PraisonAI | 4.5.15 to before 4.5.69 | 4.5.69 | Patch available | CNA |
| — | praisonai (PyPI) | 4.5.15 to before 4.5.69 | 4.5.69 | Patch available | GHSA-9gm9-c8mq-vq7m |
- PraisonAI VendorMervinPraison Affected 4.5.15 to before 4.5.69 Fixed in 4.5.69 Patch available CNA
- praisonai (PyPI) Vendor— Affected 4.5.15 to before 4.5.69 Fixed in 4.5.69 Patch available GHSA-9gm9-c8mq-vq7m
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* | 4.5.15 to before 4.5.69 | Vulnerable | MervinPraison |
- cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:* Versions 4.5.15 to before 4.5.69 Vulnerable ·MervinPraison
Remediation
- Fix · CNA PraisonAI (MervinPraison) Fixed in 4.5.69
- Fix · GHSA-9gm9-c8mq-vq7m praisonai (PyPI) Fixed in 4.5.69 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34935
- 2026-10-03 Alias added: GHSA-9gm9-c8mq-vq7m
References
More MervinPraison Praisonai vulnerabilities
- TI-2026-30083 Incomplete fix for CVE-2026-34935: Command Injection in MervinPraison/PraisonAI CVSS 3.1CRITICAL 9.8
- TI-2026-29070 PraisonAI: Critical RCE via `type: job` workflow YAML CVSS 3.1CRITICAL 9.8
- TI-2026-28940 PraisonAI has Server-Side Request Forgery via Unvalidated webhook_url in Jobs API CVSS 3.1CRITICAL 10.0
- TI-2026-28768 PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading CVSS 3.1CRITICAL 9.8
- TI-2026-27158 PraisonAI: Second-Order SQL Injection in `get_all_user_threads` CVSS 3.1CRITICAL 9.8
- TI-2026-29071 PraisonAI Browser Server allows unauthenticated WebSocket clients to hijack connected extension sessions CVSS 3.1CRITICAL 9.1
Sources
- CVE-2026-34935 · CVE Program
- CVE-2026-34935 · NVD
- FIRST EPSS
- GHSA-9gm9-c8mq-vq7m · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences