CVE-2025-12758
Validator is Vulnerable to Incomplete Filtering of One or More Instances of Special Elements
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2025-12758- CVSS 4.0
- 8.7 High
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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P - Weakness
- CWE-792, CWE-172
- Updated
- 2026-11-02
EUVDEUVD-2025-199795
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.
- Record
EUVD-2025-199795- CVSS 4.0
- 8.7 High
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-vghf-hv5q-vc2g
Validator is Vulnerable to Incomplete Filtering of One or More Instances of Special Elements
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.
- Record
GHSA-vghf-hv5q-vc2g- CVSS 4.0
- 7.7 High
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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-172, CWE-792
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-12758- CVSS 4.0
- 7.7 High
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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-792, CWE-172
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2025-12758- CVSS 4.0
- 7.7 High
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 - Weakness
- CWE-792
- Updated
- 2026-11-02
OSVGHSA-vghf-hv5q-vc2g
Validator is Vulnerable to Incomplete Filtering of One or More Instances of Special Elements
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.
- Record
GHSA-vghf-hv5q-vc2g- CVSS 4.0
- 7.7 High
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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-172, CWE-792
- Updated
- 2026-11-02
Show 4 moreShow less
OSVROOT-APP-NPM-CVE-2025-12758
CVE-2025-12758 in validator - Patched by Root
Root has patched CVE-2025-12758 in the validator package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-CVE-2025-12758- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-06
OSVCLSA-2026-1788519023 No score
TuxCare security update for validator (2 CVEs)
TuxCare rebuilt validator to address 2 CVEs. Fixed in 13.12.0-tuxcare.1.
- Record
CLSA-2026-1788519023- Updated
- 2026-11-02
OSVCLSA-2026-1789161525 No score
TuxCare security update for validator (2 CVEs)
TuxCare rebuilt validator to address 2 CVEs. Fixed in 7.2.0-tuxcare.1.
- Record
CLSA-2026-1789161525- Updated
- 2026-11-02
OSVCLSA-2026-1790175492 No score
TuxCare security update for validator (1 CVE)
TuxCare rebuilt validator to address 1 CVE. Fixed in 4.4.0-tuxcare.3.
- Record
CLSA-2026-1790175492- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
validatornpm |
before 13.15.22 | 13.15.22 |
validatorTuxCare:npm From an advisory covering 2 CVEs |
13.12.0-tuxcare.0 up to 13.12.0-tuxcare.1, plus listed versions 13.12.0 |
13.12.0-tuxcare.1 |
validatorTuxCare:npm From an advisory covering 2 CVEs |
7.2.0-tuxcare.0 up to 7.2.0-tuxcare.1, plus listed versions 7.2.0 |
7.2.0-tuxcare.1 |
validatorTuxCare:npm |
4.4.0-tuxcare.0 up to 4.4.0-tuxcare.3, plus listed versions 4.4.04.4.0-tuxcare.14.4.0-tuxcare.2 |
4.4.0-tuxcare.3 |
validatorRoot:npm |
before 13.7.0-aikido.1 | 13.7.0-aikido.17.2.0-aikido.313.12.0-aikido.213.12.0-aikido.310.11.0-aikido.113.15.15-aikido.113.11.0-aikido.17.0.0-aikido.1 |
@rootio/validatorRoot:npm |
before 13.12.0-root.io.1 | 13.12.0-root.io.17.2.0-root.io.213.7.0-root.io.17.2.0-root.io.313.12.0-root.io.213.12.0-root.io.310.11.0-root.io.113.15.15-root.io.113.11.0-root.io.17.0.0-root.io.1 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | open-flaw/CVE-2025-12758 | 2025-12-11 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | OSV | |
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-12758 is a high vulnerability (CVSS 8.7) in Validator Project Validator, published November 27, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. Fixed in validator 13.15.22.