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CVE-2026-48125— UAParser.js: Unbounded `Sec-CH-UA-Model` parsing can trigger ReDoS in `withClientHints()`

Quick assessment

Affected
faisalman ua-parser-js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

faisalman UAParser是faisalman个人开发者开源的一款User Agent字符串解析库。 faisalman UAParser 2.0.1版本至2.0.10之前版本存在资源管理错误漏洞，该漏洞源于使用Client Hints API时存在正则表达式拒绝服务，通过发送特制的Sec-CH-UA-Model标头，可能导致CPU过度消耗。

CVSS 5.3 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
faisalman ua-parser-js >= 2.0.1, < 2.0.10 affected
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I. Basic Information for CVE-2026-48125

Vulnerability Information
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Vulnerability Title
UAParser.js: Unbounded `Sec-CH-UA-Model` parsing can trigger ReDoS in `withClientHints()`
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
faisalman UAParser 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
faisalman UAParser是faisalman个人开发者开源的一款User Agent字符串解析库。 faisalman UAParser 2.0.1版本至2.0.10之前版本存在资源管理错误漏洞，该漏洞源于使用Client Hints API时存在正则表达式拒绝服务，通过发送特制的Sec-CH-UA-Model标头，可能导致CPU过度消耗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
faisalman ua-parser-js >= 2.0.1, < 2.0.10 -

II. Public POCs for CVE-2026-48125

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III. Intelligence Information for CVE-2026-48125

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Patches & Fixes for CVE-2026-48125 (1)

Vendor Advisories for CVE-2026-48125 (1)

Vendor Pages for CVE-2026-48125 (1)

IV. Related Vulnerabilities

Same product: ua-parser-js
Same weakness: CWE-400

V. Comments for CVE-2026-48125

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