ReDoS Vulnerability in ua-parser-js version
Description:
A regular expression denial of service (ReDoS) vulnerability has been discovered in ua-parser-js.
Impact:
This vulnerability bypass the library's MAX_LENGTH input limit prevention. By crafting a very-very-long user-agent string with specific pattern, an attacker can turn the script to get stuck processing for a very long time which results in a denial of service (DoS) condition.
Affected Versions:
From version 0.7.30 to before versions 0.7.33 / 1.0.33.
Patches:
A patch has been released to remove the vulnerable regular expression, update to version 0.7.33 / 1.0.33 or later.
References:
Regular expression Denial of Service - ReDoS
Credits:
Thanks to @Snyk who first reported the issue.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | ua-parser-js | >= 0.7.30, < 0.7.33, >= 0.8.0, < 1.0.33 | 0.7.33, 1.0.33 |
References
- https://github.com/faisalman/ua-parser-js/security/advisories/GHSA-fhg7-m89q-25r3
- https://nvd.nist.gov/vuln/detail/CVE-2022-25927
- https://github.com/faisalman/ua-parser-js/commit/a6140a17dd0300a35cfc9cff999545f267889411
- https://github.com/faisalman/ua-parser-js
- https://security.snyk.io/vuln/SNYK-JS-UAPARSERJS-3244450
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1333, CWE-400- Platform
- npm
- Package
ua-parser-js- Disclosed
- 24.01.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-fhg7-m89q-25r3 - CC BY 4.0
Vulnerability history: ua-parser-js
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 05.2021 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 1
Disclosures per year
- 2021: 3
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 1
-
ReDoS Vulnerability in ua-parser-js version this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.