CVE-2026-42343: Labring Fastgpt

Medium severity, CVSS 6.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Labring Fastgpt: up to and including 4.14.13

Published 2026-05-08. Last modified 2026-07-24.