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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.

PUBLISHED Reserved 2025-11-05 | Published 2025-11-27 | Updated 2025-12-03 | Assigner snyk




HIGH: 8.7CVSS: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
HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P

Problem types

Incomplete Filtering of One or More Instances of Special Elements

Credits

Karol Wrótniak

References

security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476 exploit

security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476

gist.github.com/koral--/ad31208b25b9e3d1e2e35f1d4d72572e

github.com/validatorjs/validator.js/pull/2616

cve.org (CVE-2025-12758)

nvd.nist.gov (CVE-2025-12758)

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