useragent Regular Expression Denial of Service vulnerability

Description

Useragent is a user agent parser for Node.js. All versions as of time of publication contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS).

Recommendation

No fix is available yet. Followings are affected versions:

• <= 2.3.0

References

• GHSA-mgfv-m47x-4wqp
• CVE-2020-26311
• CWE-1333
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Maker.js has Unsafe Property Copying in makerjs.extendObject - CVE-2026-24888
• Improper Validation of Query Parameters in Auth0 Next.js SDK - CVE-2025-67716
• Parse Server before v3.4.1 vulnerable to Denial of Service - CVE-2019-1020012
• @digitalocean/do-markdownit has Type Confusion vulnerability - CVE-2025-59717

Tags:

npm

useragent