Vulnerability in Validator Project
CVE-2025-12758
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 · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Validator Project
- Org.webjars.npm:validator — versions 0
- Validator — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476 (Exploit, Third Party Advisory)
- gist.github.com/koral--/ad31208b25b9e3d1e2e35f1d4d72572e (Exploit, Third Party Advisory)
- github.com/validatorjs/validator.js/pull/2616 (Patch, Issue Tracking)
- af854a3a-2127-422b-91ae-364da2661108
- security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-14152011
Frequently asked questions
- What is CVE-2025-12758?
- CVE-2025-12758 is a high-severity vulnerability in Validator Project, classified under CWE-792. CVSS score: 7.5/10. Published 2025-11-27.
- How severe is CVE-2025-12758?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-12758 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.