CVE-2026-32128

MEDIUM

6.3

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.

CVE Details

CVSS v3.1 Score6.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/11/2026

Last Modified3/19/2026

Sourcenvd

Honeypot Sightings0

Affected Products

fastgpt:fastgpt

Weaknesses (CWE)

CWE-184

References

https://github.com/labring/FastGPT/security/advisories/GHSA-6hw6-mxrm-v6wj(security-advisories@github.com)

IOC Correlations

No correlations recorded

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