What is CVE-2018-3711?

CVE-2018-3711 is a high-severity vulnerability in Fastify, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2018-06-07.

How severe is CVE-2018-3711?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Fastify

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 a very large payload.

Published 2018-06-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Fastify
HackerOne Fastify Node Module — versions Versions before 0.38.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/fastify/fastify/pull/627 (Exploit, Third Party Advisory, Issue Tracking)
hackerone.com/reports/303632 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-3711?: CVE-2018-3711 is a high-severity vulnerability in Fastify, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2018-06-07.
How severe is CVE-2018-3711?: High severity. CVSS v3 base score is 7.5 out of 10.