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CVE-2025-49131: FastGPT Sandbox Vulnerable to Sandbox Bypass

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-09 · updated 2026-06-17
• Weakness: CWE-732

Description

FastGPT is an open-source project that provides a platform for building, deploying, and operating AI-driven workflows and conversational agents. The Sandbox container (fastgpt-sandbox) is a specialized, isolated environment used by FastGPT to safely execute user-submitted or dynamically generated code in isolation. The sandbox before version 4.9.11 has insufficient isolation and inadequate restrictions on code execution by allowing overly permissive syscalls, which allows attackers to escape the intended sandbox boundaries. Attackers could exploit this to read and overwrite arbitrary files and bypass Python module import restrictions. This is patched in version 4.9.11 by restricting the allowed system calls to a safer subset and additional descriptive error messaging.

Affected products

• labring FastGPT: before 4.9.11 — fixed in 4.9.11

How to fix

Upgrade to a fixed version: labring FastGPT 4.9.11. Check the vendor advisory for mitigations.

References

• https://github.com/labring/FastGPT/commit/bb810a43a1c70683fab7f5fe993771e930a94426
• https://github.com/labring/FastGPT/pkgs/container/fastgpt-sandbox
• https://github.com/labring/FastGPT/pull/4958
• https://github.com/labring/FastGPT/releases/tag/v4.9.11
• https://github.com/labring/FastGPT/security/advisories/GHSA-f3pf-r3g7-g895

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