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    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.

    Published:Mar 11, 2026
    Last Modified:Mar 20, 2026
    EPS:Mar 11, 2026
    EPSS Score:0.00067
    CVSS Score:6.3

    Affected Products

    Vendor
    Fastgpt
    Product
    Fastgpt
    Vendor
    Labring
    Product
    Fastgpt

    Exploits

    https://github.com/labring/FastGPT/security/advisories/GHSA-6hw6-mxrm-v6wjhttps://github.com/qianlijaingshan/fastgpt-sandbox-audit

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High