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.
History

Thu, 12 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 12 Mar 2026 10:15:00 +0000

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First Time appeared Labring
Labring fastgpt
Vendors & Products Labring
Labring fastgpt

Wed, 11 Mar 2026 21:45:00 +0000

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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.
Title FastGPT Python Sandbox Bypass of File-Write Restriction
Weaknesses CWE-184
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-11T21:30:26.336Z

Updated: 2026-03-12T16:18:13.936Z

Reserved: 2026-03-10T22:19:36.545Z

Link: CVE-2026-32128

cve-icon Vulnrichment

Updated: 2026-03-12T15:31:52.975Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-11T22:16:32.633

Modified: 2026-03-12T21:08:22.643

Link: CVE-2026-32128

cve-icon Redhat

No data.