CVE-2026-31220: n/a
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.
AI Analysis
Technical Summary
PySyft (Syft Datasite/Server) versions 0.9.5 and earlier allow remote code execution because user-submitted Python functions, submitted via @sy.syft_function(), are executed on the server after approval without adequate security checks or sandboxing. The use of exec() and eval() on approved code within the server process enables attackers to run arbitrary code, resulting in complete compromise of the server environment. The vulnerability is identified as CWE-94 (Improper Control of Generation of Code).
Potential Impact
An attacker with the ability to submit code can execute arbitrary Python commands on the server, leading to full confidentiality, integrity, and availability compromise. This includes unauthorized data access, modification, deletion, and potential takeover of the server hosting PySyft.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict or disable the ability for untrusted users to submit code for remote execution. Implement additional manual code review and sandboxing measures to isolate execution environments and prevent arbitrary code execution.
CVE-2026-31220: n/a
Description
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.
CVSS v3.1
Score 9.8critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PySyft (Syft Datasite/Server) versions 0.9.5 and earlier allow remote code execution because user-submitted Python functions, submitted via @sy.syft_function(), are executed on the server after approval without adequate security checks or sandboxing. The use of exec() and eval() on approved code within the server process enables attackers to run arbitrary code, resulting in complete compromise of the server environment. The vulnerability is identified as CWE-94 (Improper Control of Generation of Code).
Potential Impact
An attacker with the ability to submit code can execute arbitrary Python commands on the server, leading to full confidentiality, integrity, and availability compromise. This includes unauthorized data access, modification, deletion, and potential takeover of the server hosting PySyft.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict or disable the ability for untrusted users to submit code for remote execution. Implement additional manual code review and sandboxing measures to isolate execution environments and prevent arbitrary code execution.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-03-09T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a034c84cbff5d8610fe99e2
Added to database: 05/12/2026, 15:51:32 UTC
Last enriched: 05/19/2026, 18:17:17 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 62
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