CVE-2018-12123

Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Hostname spoofing in URL parser for javascript protocol: If a Node.js application is using url.parse() to determine the URL hostname, that hostname can be spoofed by using a mixed case "javascript:" (e.g. "javAscript:") protocol (other protocols are not affected). If security decisions are made about the URL based on the hostname, they may be incorrect.

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS

4.0% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-25)

CWEs

CWE-20, CWE-115

Published

2018-11-28

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• nodejs:node.js

References

• https://access.redhat.com/errata/RHSA-2019:1821
• https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/
• https://security.gentoo.org/glsa/202003-48
• https://access.redhat.com/errata/RHSA-2019:1821
• https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/

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