CVEvulnerability
CVE-2026-48125
5.3 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-14
- Last modified
- 2026-10-24
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-1333, CWE-400
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.
Affected configurations
• ua-parser-js project ua-parser-js (>= 2.0.1 < 2.0.10)
Related
References
- https://github.com/faisalman/ua-parser-js/commit/90354d3458495628b1d3ba68a9d76673e6d14fc5 Patch
- https://github.com/faisalman/ua-parser-js/releases/tag/2.0.10 Release Notes
- https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x599 Exploit, Vendor Advisory
- https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x599 Exploit, Vendor Advisory