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CVE-2026-48125

5.3 medium SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 3

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · ua-parser-js_projectNVD modified 2026-10-24 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:ua-parser-js_project:ua-parser-js:*:*:*:*:*:node.js:*:*

References 4