CVE-2025-12758
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-27

Last updated on: 2025-12-30

Assigner: Snyk

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.
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Meta Information
Published
2025-11-27
Last Modified
2025-12-30
Generated
2026-06-16
AI Q&A
2025-11-27
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12758
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
validator_project validator to 13.15.22 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-792 The product receives data from an upstream component, but does not completely filter one or more instances of special elements before sending it to a downstream component.
CWE-172 The product does not properly encode or decode the data, resulting in unexpected values.
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Executive Summary

This vulnerability exists in versions of the package validator before 13.15.22, where the isLength() function does not properly filter or account for Unicode variation selectors (\uFE0F, \uFE0E) in strings. This causes the function to miscalculate the string length, potentially allowing strings longer than intended to pass validation.

Impact Analysis

Because the isLength() function miscalculates string length, applications using it for input validation may accept strings significantly longer than expected. This can lead to issues such as data truncation in databases, buffer overflows in other system components, or denial-of-service conditions.

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