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.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/labring/FastGPT/security/advisories/GHSA-6hw6-mxrm-v6wj	Vendor Advisory Exploit Mitigation

Configurations

Configuration 1 (hide)

cpe:2.3:a:fastgpt:fastgpt:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-11 22:16

Updated : 2026-03-19 17:38

NVD link : CVE-2026-32128

Mitre link : CVE-2026-32128

CVE.ORG link : CVE-2026-32128

JSON object : View

Products Affected

fastgpt

fastgpt

CWE

CWE-184

Incomplete List of Disallowed Inputs

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