CVE-2022-25839: Improper Input Validation

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-03-11 · updated 2026-06-17
Weakness: CWE-20

Description

The package url-js before 2.1.0 are vulnerable to Improper Input Validation due to improper parsing, which makes it is possible for the hostname to be spoofed. http://\\\\\\\\localhost and http://localhost are the same URL. However, the hostname is not parsed as localhost, and the backslash is reflected as it is.

Affected products

url-js: before 2.1.0 — fixed in 2.1.0

How to fix

Upgrade to a fixed version: url-js 2.1.0. Check the vendor advisory for mitigations.

References

https://github.com/duzun/URL.js/commit/9dc9fcc99baa4cbda24403d81a589e9b0f4121d0
https://snyk.io/vuln/SNYK-JS-URLJS-2414030
https://github.com/duzun/URL.js/commit/9dc9fcc99baa4cbda24403d81a589e9b0f4121d0
https://snyk.io/vuln/SNYK-JS-URLJS-2414030

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