CVE-2025-12758: Versions of the package validator before 13.15.22 are vulnerable to Incomplete Filtering of One or More Instan

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HIGH 7.5REMOTEUPGRADE

CVE-2025-12758 is a high-severity flaw (CVSS 7.5) affecting validator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Versions of the package validator before 13.15.22 are vulnerable to Incomplete Filtering of One or More Instances of Special Elements in the isLength() function that does not take into account Unicode variation selectors (\uFE0F, \uFE0E) appearing in a sequence which lead to improper string length calculation. This can lead to an application using isLength for input validation accepting strings significantly longer than intended, resulting in iss

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-792, CWE-172
Published	2025-11-27
Last modified	2026-10-19

Publisher (CNA): Snyk · Vendor: validator project

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-27 05:16 UTCPublished CVE record published
2026-10-19 13:10 UTCUpdated Record last modified

validator project validator UPGRADE

Affected: < 13.15.22

Fixed in: 13.15.22

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls validator

2. UPGRADE to 13.15.22

npm install validator@">=13.15.22"

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-2025-12758?

validator: upgrade to 13.15.22. Exact commands for each OS are on this page.

Is CVE-2025-12758 being exploited?

CVE-2025-12758 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-2025-12758 affect?

CVE-2025-12758 affects validator. Severity is high (CVSS 7.5). Versions of the package validator before 13.15.22 are vulnerable to Incomplete Filtering of One or More Instances of Special Elements in the isLength() function that does not take into account Unicode variation selectors (\uFE0F, \uFE0E) ap

How urgent is CVE-2025-12758?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-56200 MEDIUM 6.1 UPGRADE A URL validation bypass vulnerability exists in validator.js through version 13.15.15
CVE-2025-15104 MEDIUM 5.3 UPGRADE Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server p

References

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