What’s Vulnerable › Vulnerabilities

CVE-2020-7754: Regular Expression Denial of Service (ReDoS)

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-27 · updated 2026-06-17

Description

This affects the package npm-user-validate before 1.0.1. The regex that validates user emails took exponentially longer to process long input strings beginning with @ characters.

Affected products

• npm-user-validate: before 1.0.1 — fixed in 1.0.1

How to fix

Upgrade to a fixed version: npm-user-validate 1.0.1. Check the vendor advisory for mitigations.

References

• https://github.com/npm/npm-user-validate/commit/c8a87dac1a4cc6988b5418f30411a8669bef204e
• https://github.com/npm/npm-user-validate/security/advisories/GHSA-xgh6-85xh-479p
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1019353
• https://snyk.io/vuln/SNYK-JS-NPMUSERVALIDATE-1019352
• https://github.com/npm/npm-user-validate/commit/c8a87dac1a4cc6988b5418f30411a8669bef204e
• https://github.com/npm/npm-user-validate/security/advisories/GHSA-xgh6-85xh-479p
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1019353
• https://snyk.io/vuln/SNYK-JS-NPMUSERVALIDATE-1019352

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