CVE-2025-12758

High

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.

SeverityHigh
CVSS7.5
Exploit probability—
ProductValidator
PublishedNov 27, 2025
First seenNov 27, 2025
Weakness typeCWE-792CWE-792

How to fix

Update
  • validator_project validator13.15.22 or later
  • validator13.15.22 or later

Affected products

ProductAffected versionsFixed in
validator_project validatorv < 13.15.2213.15.22
validatornpmv < 13.15.2213.15.22

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