---
id: CVE-2018-12121
title: >-
  Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0:
  Denial of Service with large HTTP headers: By using a combination of many
  requests with maximum sized headers (almost 80 KB per connection), and
  carefully timed c…
summary: >-
  Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0:
  Denial of Service with large HTTP headers: By using a combination of many
  requests with maximum sized headers (almost 80 KB per connection), and
  carefully timed c…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-400
vendor: nodejs
product: node.js
affected:
  - 'node.js >= 6.0.0, < 6.15.0'
  - 'node.js >= 8.0.0, < 8.14.0'
  - 'node.js >= 10.0.0, < 10.14.0'
  - 'node.js >= 11.0.0, < 11.3.0'
  - enterprise_linux = 8.0
  - enterprise_linux_desktop = 7.0
  - enterprise_linux_eus = 8.1
  - enterprise_linux_eus = 8.2
  - enterprise_linux_eus = 8.4
  - enterprise_linux_eus = 8.6
  - enterprise_linux_server = 7.0
  - enterprise_linux_server_aus = 8.2
  - enterprise_linux_server_aus = 8.4
  - enterprise_linux_server_aus = 8.6
  - enterprise_linux_server_tus = 8.2
  - enterprise_linux_server_tus = 8.4
  - enterprise_linux_server_tus = 8.6
  - enterprise_linux_workstation = 7.0
patched:
  - node.js 11.3.0
published: '2018-11-28'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:16:44.877'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-12121'
references:
  - url: 'http://www.securityfocus.com/bid/106043'
    label: cve-request@iojs.org
  - url: 'https://access.redhat.com/errata/RHSA-2019:1821'
    label: cve-request@iojs.org
  - url: 'https://access.redhat.com/errata/RHSA-2019:2258'
    label: cve-request@iojs.org
  - url: 'https://access.redhat.com/errata/RHSA-2019:3497'
    label: cve-request@iojs.org
  - url: 'https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/'
    label: cve-request@iojs.org
  - url: 'https://security.gentoo.org/glsa/202003-48'
    label: cve-request@iojs.org
  - url: 'http://www.securityfocus.com/bid/106043'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2019:1821'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2019:2258'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2019:3497'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202003-48'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20241227-0008/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.10207
epssPercentile: 0.95563
ingestedAt: '2026-10-08T23:16:47.295Z'
---

## Overview

Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Denial of Service with large HTTP headers: By using a combination of many requests with maximum sized headers (almost 80 KB per connection), and carefully timed completion of the headers, it is possible to cause the HTTP server to abort from heap allocation failure. Attack potential is mitigated by the use of a load balancer or other proxy layer.

## Affected

- `node.js >= 6.0.0, < 6.15.0`
- `node.js >= 8.0.0, < 8.14.0`
- `node.js >= 10.0.0, < 10.14.0`
- `node.js >= 11.0.0, < 11.3.0`
- `enterprise_linux = 8.0`
- `enterprise_linux_desktop = 7.0`
- `enterprise_linux_eus = 8.1`
- `enterprise_linux_eus = 8.2`
- `enterprise_linux_eus = 8.4`
- `enterprise_linux_eus = 8.6`
- `enterprise_linux_server = 7.0`
- `enterprise_linux_server_aus = 8.2`
- `enterprise_linux_server_aus = 8.4`
- `enterprise_linux_server_aus = 8.6`
- `enterprise_linux_server_tus = 8.2`
- `enterprise_linux_server_tus = 8.4`
- `enterprise_linux_server_tus = 8.6`
- `enterprise_linux_workstation = 7.0`

## Remediation

Upgrade past the affected range:

- `node.js 11.3.0`