Medium severity5.3NVD Advisory· Published Jul 14, 2026· Updated Aug 6, 2026
CVE-2026-48125
CVE-2026-48125
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
ua-parser-jsnpm | >= 2.0.1, < 2.0.10 | 2.0.10 |
Affected products
3- cpe:2.3:a:ua-parser-js_project:ua-parser-js:*:*:*:*:*:node.js:*:*Range: >=2.0.1,<2.0.10
- Range: >=2.0.1, <=2.0.9
Patches
Vulnerability mechanics
References
4- github.com/faisalman/ua-parser-js/commit/90354d3458495628b1d3ba68a9d76673e6d14fc5nvdPatch
- github.com/faisalman/ua-parser-js/security/advisories/GHSA-9h5v-pfqq-x599nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-9h5v-pfqq-x599ghsaADVISORY
- github.com/faisalman/ua-parser-js/releases/tag/2.0.10nvdRelease Notes
News mentions
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