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HIGH severity

Inefficient Regular Expression Complexity in vuelidateGHSA-vvf2-ppj9-pp49

HIGHFix: vuelidate/vuelidate@1f0ca31

GHSA-vvf2-ppj9-pp49 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in @vuelidate/validators. 1 public exploit reference exists, so weaponization risk is real. A fix is available for @vuelidate/validators — see the affected versions and patch details below.

Also known asCVE-2021-3794
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.00%0.57%1.15%1.72%0.3%1.2%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-vvf2-ppj9-pp49 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

256other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@vuelidate/validatorsnpm
488Kdownloads / week

Description

vuelidate is a simple, lightweight model-based validation for Vue.js 2.x & 3.0. A ReDoS (regular expression denial of service) flaw was found in the @vuelidate/validators package. An attacker that is able to provide crafted input to the url(input) function may cause an application to consume an excessive amount of CPU.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@vuelidate/validatorsall versions2.0.0-alpha.22npm install @vuelidate/validators@2.0.0-alpha.22

Affected Products

1 product · 28 configurations
Application
vuelidatevuelidate_project
< 0.7.7
2 versions
1.0.02.0.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

vuelidate is vulnerable to Inefficient Regular Expression Complexity

huntr.devNVDSep 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @vuelidate/validators, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @vuelidate/validators to 2.0.0-alpha.22 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vvf2-ppj9-pp49 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

vuelidate is a simple, lightweight model-based validation for Vue.js 2.x & 3.0. A ReDoS (regular expression denial of service) flaw was found in the `@vuelidate/validators` package. An attacker that is able to provide crafted input to the url(input) function may cause an application to consume an excessive amount of CPU.
O3 Security · Impact-Aware SCA

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Inefficient Regular Expression Complexity in vuelidate