Cyber Resilience

CVE-2025-12758

HighPublic PoC

Published: 27 November 2025

Published
27 November 2025
Modified
29 January 2026
KEV Added
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Patch
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CVSS Score v4 7.7 CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0011 29.3th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-12758 is a high-severity Incomplete Filtering of One or More Instances of Special Elements (CWE-792) vulnerability in Validator Project Validator. Its CVSS base score is 7.7 (High).

Operationally, ranked at the 29.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

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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.

CWE(s)
CWE-792CWE-172

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

validator project
validator
≤ 13.15.22

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References