Improper Input Validation

published 2022-03-11 4 y ago modified 2026-07-08 4 mo ago also GHSA-rf54-44jr-q5vf , EUVD-2022-1531

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 links 2

npm url-js 2.1.0
n/a url-js 2.1.0

github.com/duzun/URL.js@9dc9fcc commit
snyk.io/vuln/SNYK-JS-URLJS-2414030 advisory

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

snyk.io https://snyk.io/vuln/SNYK-JS-URLJS-2414030 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	url-js	<2.1.0	2.1.0

Affected products

n/a url-js

Classification

Weakness

CWE-20 Improper Input Validation

References

github.com /duzun/URL.js/commit/9dc9fcc99baa4cbda24403d81a589e9b0f4121d0
web, patch, third-party-advisory
snyk.io /vuln/SNYK-JS-URLJS-2414030
web, exploit, patch, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2022-25839
advisory
github.com /duzun/URL.js
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary