Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2018-12121

CVE-2018-12121HIGH

The Node.js Project Node.js — 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 combinat…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .1021   95.6     —

AFFECTED
  Product  Versions                                                            Fixed
  Node.js  All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0 –  —

TIMELINE
  Jun 11  Reserved by nodejs
  Nov 28  Published (CNA: nodejs)
  Oct 8   ENRICHED — CVE-2018-12121 (The Node.js Project Node.js). Received CVSS 7.5 and CPE data from NVD.

CWE-400 · CNA: nodejs · CVSS v3.1 · 7 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 11, 2018	Reserved	Reserved by nodejs
November 28, 2018	Published	Published (CNA: nodejs)
October 8, 2026	ENRICHED	ENRICHED — CVE-2018-12121 (The Node.js Project Node.js). Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
The Node.js Project	Node.js	—	All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0	—

Weaknesses

CWE-400

References (7)

http://www.securityfocus.com/bid/106043 [Third Party Advisory, VDB Entry]
https://access.redhat.com/errata/RHSA-2019:1821 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:2258 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:3497 [Third Party Advisory]
https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/ [Patch, Vendor Advisory]
https://security.gentoo.org/glsa/202003-48 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20241227-0008/

Authoritative record: CVE-2018-12121 at cve.org

Vendors: the node.js project

Weaknesses: CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2018-12121 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.