CVE-2026-32128: 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…

PriorityP340medium6.3CVSS 3.1

AVNACLPRLUINSUCLILAL

EPSS

0.30%

21.2th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
fastgpt	fastgpt	<= 4.14.7	—
labring	fastgpt	<= 4.14.7	—

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