CVE-2026-32128
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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2Description
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.
Analysis
FastGPT's Python Sandbox in versions 4.14.7 and earlier allows authenticated users to bypass file write restrictions by remapping standard output to arbitrary file descriptors via fcntl, enabling unauthorized file creation and modification within the container. The vulnerability exploits a gap between static detection and seccomp filtering, where remapped stdout still satisfies the write syscall rules. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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