CVE-2026-32128

MediumCVSS 6.3/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Weakness enumeration

CWE-184

Affected software

Vendor	Product	Versions
labring	FastGPT	<= 4.14.7

References

https://github.com/labring/FastGPT/security/advisories/GHSA-6hw6-mxrm-v6wjExploit, Mitigation, Vendor Advisory

Timeline

Published: Mar 11, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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