PatchTheCVECVE-2021-43306: An exponential ReDoS (Regular Expression Denial of Service) can be triggered in the jquery-validation npm pack
CVE-2021-43306 is a medium-severity flaw (CVSS 5.9) affecting jquery validation. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.5% (top 25%) |
| CISA exploited list | No |
| Weakness | CWE-1333 |
| Published | 2022-06-02 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-43306?
jquery validation: upgrade to 1.19.4. Exact commands for each OS are on this page.
Is CVE-2021-43306 being exploited?
CVE-2021-43306 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-43306 affect?
CVE-2021-43306 affects jquery validation. Severity is medium (CVSS 5.9). 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
How urgent is CVE-2021-43306?
Priority 49/100. Public exploit reference; Remotely exploitable, no login, no user action
Software pages
npm packages vulnerabilities · jQuery vulnerabilities
Related CVEs
- CVE-2022-31147 HIGH 7.5 UPGRADE The jQuery Validation Plugin (jquery-validation) provides drop-in validation for forms
- CVE-2021-21252 MEDIUM 5.3 UPGRADE MITIGATE The jQuery Validation Plugin provides drop-in validation for your existing forms