Vulnerability Description
UAParser.js is a JavaScript library to detect browsers, operating systems, CPUs, and devices from user-agent data. From 2.0.1 until 2.0.10, a regular expression denial-of-service vulnerability exists when using the Client Hints API. By sending a crafted Sec-CH-UA-Model header to an application that calls UAParser(headers).withClientHints(), an attacker can cause excessive CPU time due to catastrophic backtracking in the device regex because Client Hints values are copied without the UA_MAX_LENGTH limit used for User-Agent values. This issue is fixed in version 2.0.10.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ua-Parser-Js Project | Ua-Parser-Js | >= 2.0.1, < 2.0.10 |
Related Weaknesses (CWE)
References
- https://github.com/faisalman/ua-parser-js/commit/90354d3458495628b1d3ba68a9d7667Patch
- https://github.com/faisalman/ua-parser-js/releases/tag/2.0.10Release Notes
- https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x59ExploitVendor Advisory
- https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x59ExploitVendor Advisory
FAQ
What is CVE-2026-48125?
CVE-2026-48125 is a vulnerability with a CVSS score of 5.3 (MEDIUM). UAParser.js is a JavaScript library to detect browsers, operating systems, CPUs, and devices from user-agent data. From 2.0.1 until 2.0.10, a regular expression denial-of-service vulnerability exists ...
How severe is CVE-2026-48125?
CVE-2026-48125 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48125?
Check the references section above for vendor advisories and patch information. Affected products include: Ua-Parser-Js Project Ua-Parser-Js.