CVE-2026-48125

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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
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

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2026-07-14 21:16

Updated : 2026-08-06 18:25

NVD link : CVE-2026-48125

Mitre link : CVE-2026-48125

CVE.ORG link : CVE-2026-48125

JSON object : View

Products Affected

ua-parser-js_project

ua-parser-js

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-1333

Inefficient Regular Expression Complexity

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