CVE-2025-12758: Validator Project Validator

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Validator Project Validator: before 13.15.22 (fixed in 13.15.22)

Published 2025-11-27. Last modified 2026-07-14.