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CVE-2026-32128

FastGPT Python Sandbox Bypass of File-Write Restriction PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
labring / FastGPTaffected <= 4.14.7

CWE

CWE-184

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.