CVE-2022-25839: The package url-js before 2.1.0 are vulnerable to Improper Input Validation due to improper parsing, which mak

Routine

MEDIUM 4.3UPGRADE

CVE-2022-25839 is a medium-severity flaw (CVSS 4.3) affecting url-js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-20
Published	2022-03-11
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: url-js project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-03-11 20:15 UTCPublished CVE record published
2026-06-17 04:34 UTCUpdated Record last modified

url-js project url-js UPGRADE

Affected: < 2.1.0

Fixed in: 2.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls url-js

2. UPGRADE to 2.1.0

npm install url-js@">=2.1.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-25839?

url-js: upgrade to 2.1.0. Exact commands for each OS are on this page.

Is CVE-2022-25839 being exploited?

CVE-2022-25839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-25839 affect?

CVE-2022-25839 affects url-js. Severity is medium (CVSS 4.3). 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 hos

How urgent is CVE-2022-25839?

Priority 35/100. Public exploit reference

References

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