VULNERABILITY INTELLIGENCE

CVE-2026-48125

CVSS score5.3 MEDIUM

EPSS probability0.52%

CISA KEVNot currently listed

Published2026-07-14

Last modified2026-10-24

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Weakness classification

security-advisories@github.com: CWE-400

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Release Notes
security-advisories@github.com — Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Vendor Advisory