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6.3
FastGPT 4.14.7 and earlier allows arbitrary file creation/overwrites
CVE-2026-32128
Summary
FastGPT's Python Sandbox's security restrictions can be bypassed, allowing files to be created or overwritten inside the sandbox. This could be a concern for users who rely on the sandbox to protect sensitive data. Update to a version of FastGPT 4.14.8 or later to fix this issue.
Original title
FastGPT is an AI Agent building platform. In 4.14.7 and earlier, FastGPT's Python Sandbox (fastgpt-sandbox) includes guardrails intended to prevent file writes (static detection + seccomp). These g...
Original description
FastGPT is an AI Agent building platform. In 4.14.7 and earlier, FastGPT's Python Sandbox (fastgpt-sandbox) includes guardrails intended to prevent file writes (static detection + seccomp). These guardrails are bypassable by remapping stdout (fd 1) to an arbitrary writable file descriptor using fcntl. After remapping, writing via sys.stdout.write() still satisfies the seccomp rule write(fd==1), enabling arbitrary file creation/overwrite inside the sandbox container despite the intended no file writes restriction.
nvd CVSS3.1
6.3
Vulnerability type
CWE-184
Published: 11 Mar 2026 · Updated: 14 Mar 2026 · First seen: 11 Mar 2026