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Vulnerability record · CVE-2018-3711 · published 7 June 2018

CVE-2018-3711: Fastify allocation without limits vulnerability

Fastify · Fastify

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.

7.5 CVSS 3.1 High EPSS 1.8% · top 22.4% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score, v2 5.0
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/fastify/fastify/pull/627 ExploitIssue TrackingThird Party Advisory
https://hackerone.com/reports/303632 ExploitIssue TrackingThird Party Advisory
https://github.com/fastify/fastify/pull/627 ExploitIssue TrackingThird Party Advisory
https://hackerone.com/reports/303632 ExploitIssue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-3711), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.