FastGPT — Dos (CVE-2026-42343)
Date: 2026-05
Attack vector: dos
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-42343
CWE: CWE-400

FastGPT is an AI Agent building platform. In versions 4.14.13 and prior, the code-sandbox component suffers from insufficient resource isolation and uncontrolled resource consumption. The service relies solely on an application-level soft limit (a 500ms polling interval) for memory management and lacks strict OS-level constraints such as cgroups or kernel-level namespaces. This architectural weakness allows attackers to easily bypass memory checks via time-window attacks, or exhaust the entire JavaScript worker pool via concurrent CPU-intensive requests, resulting in a complete Denial of Service (DoS) for legitimate users. At time of publication, there are no publicly available patches.


Mitigations:

Architectural layers (MAESTRO):