faisalman ua-parser-js up to 2.0.9 Client Hints API UAParser.js withClientHints Sec-CH-UA-Model incorrect regex

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k2.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in faisalman ua-parser-js up to 2.0.9. This impacts the function withClientHints of the file UAParser.js of the component Client Hints API. Such manipulation of the argument Sec-CH-UA-Model leads to incorrect regex. This vulnerability is listed as CVE-2026-48125. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in faisalman ua-parser-js up to 2.0.9 and classified as problematic. Affected by this issue is the function withClientHints of the file UAParser.js of the component Client Hints API. The manipulation of the argument Sec-CH-UA-Model with an unknown input leads to a incorrect regex vulnerability. Using CWE to declare the problem leads to CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-48125 since 05/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 2.0.10 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Incorrect regex
CWE: CWE-185 / CWE-697
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: ua-parser-js 2.0.10

Timelineinfo

05/20/2026 CVE reserved
07/14/2026 +55 days VulDB entry created
07/15/2026 +0 days Advisory disclosed
07/15/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-48125 (🔒)
GCVE (CVE): GCVE-0-2026-48125
GCVE (VulDB): GCVE-100-379058

Entryinfo

Created: 07/15/2026 01:52
Changes: 07/15/2026 01:52 (56)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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