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High

Regular Expression Denial of Service (ReDoS) in ua-parser-js

  • Disclosed: 06.05.2021
  • Updated: 11.10.2026 10:22

ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.

Affected software

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PlatformPackageVulnerable versionsFixed in
npm package ua-parser-js >= 0.7.14, < 0.7.24 0.7.24

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-400
Platform
npm
Package
ua-parser-js
Disclosed
06.05.2021
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-78cj-fxph-m83p - 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

  1. UAParser.js: Unbounded `Sec-CH-UA-Model` parsing can trigger ReDoS in `withClientHints()`
    Medium · 5.3 CVE-2026-48125 >= 2.0.1, < 2.0.10 2.0.10
  2. ReDoS Vulnerability in ua-parser-js version
    High · 7.5 CVE-2022-25927 >= 0.7.30, < 0.7.33, >= 0.8.0, < 1.0.33 0.7.33, 1.0.33
  3. ua-parser-js Regular Expression Denial of Service vulnerability
    High · 7.5 CVE-2020-7793 < 0.7.23 0.7.23
  4. Embedded malware in ua-parser-js
    High · 8.8 CVE-2021-4229 >= 0.7.29, < 0.7.30, >= 0.8.0, < 0.8.1, >= 1.0.0, < 1.0.1 0.7.30, 0.8.1, 1.0.1
  5. Regular Expression Denial of Service in ua-parser-js
    High · 7.5 CVE-2020-7733 < 0.7.22 0.7.22
  6. Regular Expression Denial of Service (ReDoS) in ua-parser-js this entry
    High · 7.5 CVE-2021-27292 >= 0.7.14, < 0.7.24 0.7.24

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