# 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.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 May 2026
- **Updated:** 12 May 2026
- **Also known as:** GHSA-qv7v-r94x-6x3x

## 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 (Uncontrolled Resource Consumption)

## 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.

## Is CVE-2026-42343 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42343 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42343 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42343 exists.

Affected product: labring FastGPT. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-42343/ (Markdown: https://insights.sbomify.com/CVE-2026-42343/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42343
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42343
- OSV: https://osv.dev/vulnerability/CVE-2026-42343

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42343/
Summaries are generated and may contain mistakes; the official description above is the record.