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 (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 products

Fastgpt

Fastgpt

≤ 4.14.7

Fix

Available

CVSS 3.1

6.3 MEDIUM

EPSS

0.3% (22th percentile)

Weakness

CWE-184

NVD status

Analyzed

Published

2026-03-11