fast-xml-parser vulnerable to Regex Injection via Doctype Entities

Description

“fast-xml-parser” allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for DoS attacks.

Recommendation

Update the fast-xml-parser package to the latest compatible version. Followings are version details:

• Affected version(s): >= 4.1.3, < 4.2.4
• Patched version(s): 4.2.4

References

• GHSA-6w63-h3fj-q4vw
• CVE-2023-34104
• CWE-1333
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Bootstrap Cross-site Scripting vulnerability (GHSA-pj7m-g53m-7638) - CVE-2018-14041
• Nuxt has Client-Side Path Traversal in Nuxt Island Payload Revival - CVE-2025-59414
• @astrojs/node's trailing slash handling causes open redirect issue - CVE-2025-55207
• Linkify Allows Prototype Pollution & HTML Attribute Injection (XSS) - CVE-2025-8101

Tags:

npm

fast-xml-parser