CVE-2018-12121

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.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

10% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-25)

CWE

CWE-400

Published

2018-11-28

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• nodejs:node.js
• redhat:enterprise_linux
• redhat:enterprise_linux_desktop
• redhat:enterprise_linux_eus
• redhat:enterprise_linux_server
• redhat:enterprise_linux_server_aus
• redhat:enterprise_linux_server_tus
• redhat:enterprise_linux_workstation

References

• http://www.securityfocus.com/bid/106043
• https://access.redhat.com/errata/RHSA-2019:1821
• https://access.redhat.com/errata/RHSA-2019:2258
• https://access.redhat.com/errata/RHSA-2019:3497
• https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/

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