CVE-2026-42343 FastGPT: Uncontrolled Resource Consumption leading to Sandbox Exhaustion
Attackers can cause Denial of Service in FastGPT by exhausting sandbox resources through concurrent CPU-intensive requests or bypassing memory limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42343?
CVE-2026-42343 is a medium-severity denial of service vulnerability in labring FastGPT, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2026-42343?
How do I fix CVE-2026-42343?
No fix has been published for CVE-2026-42343 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-42343 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42343 exists.
Sources
Also known as GHSA-qv7v-r94x-6x3x.