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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.7 HIGHCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.52% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-792, CWE-172
- Affected
- validator project/validator
- Source
- report@snyk.io
References
- https://gist.github.com/koral--/ad31208b25b9e3d1e2e35f1d4d72572eExploit, Third Party Advisory
- https://github.com/validatorjs/validator.js/pull/2616Issue Tracking, Patch
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-14152011
- https://security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476Exploit, Third Party Advisory
- http://seclists.org/fulldisclosure/2026/Jan/27
- https://security.snyk.io/vuln/SNYK-JS-VALIDATOR-13653476Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.