CVE-2025-12758

Name: CVE-2025-12758
Creator: NVD / NIST
Published: 2025-11-27T05:16:12.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.7/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2025-12758 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. 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 issues like data truncation in databases, buffer overflows in other system components, or denial-of-service.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

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 issues like data truncation in databases, buffer overflows in other system components, or denial-of-service.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

7.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.44%

34.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Validator Project	Validator	< 13.15.22

References

https://gist.github.com/koral--/ad31208b25b9e3d1e2e35f1d4d72572eExploit, Third Party Advisory
https://github.com/validatorjs/validator.js/pull/2616Issue Tracking, Patch
https://security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476Exploit, Third Party Advisory
http://seclists.org/fulldisclosure/2026/Jan/27
https://security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476Exploit, Third Party Advisory

Timeline

Published: Nov 27, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-12758?

How severe is CVE-2025-12758?

CVE-2025-12758 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2025-12758?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-12758?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST