PraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_code
Priority HIGH 82CWE-693Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- 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-693.
Summary
PraisonAI is a multi-agent teams system. Prior to version 1.5.90, execute_code() in praisonai-agents runs attacker-controlled Python inside a three-layer sandbox that can be fully bypassed by passing a str subclass with an overridden startswith() method to the _safe_getattr wrapper, achieving arbitrary OS command execution on the host. This issue has been patched in version 1.5.90.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.13398 96th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed PraisonAI (MervinPraison): 1.5.90praisonaiagents (PyPI): 1.5.90
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 | before 1.5.90 | 1.5.90 | Patch available | CNA |
| — | praisonaiagents (PyPI) | before 1.5.90 | 1.5.90 | Patch available | GHSA-6vh2-h83c-9294 |
- PraisonAI VendorMervinPraison Affected before 1.5.90 Fixed in 1.5.90 Patch available CNA
- praisonaiagents (PyPI) Vendor— Affected before 1.5.90 Fixed in 1.5.90 Patch available GHSA-6vh2-h83c-9294
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:praison:praisonaiagents:*:*:*:*:*:*:*:* | before 1.5.90 | Vulnerable | MervinPraison |
- cpe:2.3:a:praison:praisonaiagents:*:*:*:*:*:*:*:* Versions before 1.5.90 Vulnerable ·MervinPraison
Remediation
- Fix · CNA PraisonAI (MervinPraison) Fixed in 1.5.90
- Fix · GHSA-6vh2-h83c-9294 praisonaiagents (PyPI) Fixed in 1.5.90 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34938
- 2026-10-03 Alias added: GHSA-6vh2-h83c-9294
- 2026-10-25 EPSS moved to the 95th–99th percentile
References
More MervinPraison Praisonaiagents vulnerabilities
- TI-2026-29070 PraisonAI: Critical RCE via `type: job` workflow YAML 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
- TI-2026-32306 PraisonAI has unsafe tool resolution in `ToolExecutionMixin.execute_tool`: undeclared `__main__` callables execute CVSS 3.1HIGH 8.6
- TI-2026-27178 PraisonAI: SSRF in FileTools.download_file() via Unvalidated URL CVSS 3.1HIGH 8.6
- TI-2026-27161 PraisonAI: Shell Injection in run_python() via Unescaped $() Substitution CVSS 3.1CRITICAL 9.8
- TI-2026-28937 PraisonAIAgents has an OS Command Injection via shell=True in Memory Hooks Executor (memory/hooks.py) CVSS 4.0CRITICAL 9.3
Sources
- CVE-2026-34938 · CVE Program
- CVE-2026-34938 · NVD
- FIRST EPSS
- GHSA-6vh2-h83c-9294 · 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