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Not in CISA KEV
HIGH severity

CVE-2021-43306 — jquery-validation

HIGHFix: jquery-validation/jquery-validation#2428

CVE-2021-43306 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in jquery-validation. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for jquery-validation — see the affected versions and patch details below.

Regular expression denial of service in jquery-validation

Also known asGHSA-j9m2-h2pv-wvph
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk
0.33%0.89%1.46%2.02%0.8%1.5%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

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.

342other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
jquery-validationnpm
358Kdownloads / week

Description

An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the jquery-validation npm package, when an attacker is able to supply arbitrary input to the url2 method

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmjquery-validationall versions1.19.4npm install jquery-validation@1.19.4

Affected Products

1 product · 1 configurations
Application
jquery validationjqueryvalidation
< 1.19.4
range
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.

An exponential ReDoS (Regular Expression Denial of Service) can be trigg…

research.jfrog.comNVDJun 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update jquery-validation to 1.19.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-43306 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

An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the jquery-validation npm package, when an attacker is able to supply arbitrary input to the url2 method
O3 Security · Impact-Aware SCA

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CVE-2021-43306: jquery-validation DoS — Fixed in 1.19.4