fast-xml-parser has RangeError DoS Numeric Entities Bug

Description

A RangeError vulnerability exists in the numeric entity processing of fast-xml-parser when parsing XML with out-of-range entity code points (e.g., � or �). This causes the parser to throw an uncaught exception, crashing any application that processes untrusted XML input.

Recommendation

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

• Affected version(s): >= 4.3.6, <= 5.3.3
• Patched version(s): 5.3.4

References

• GHSA-37qj-frw5-hhjh
• CVE-2026-25128
• CWE-248
• CAPEC-310
• OWASP 2021-A6

Related Issues

• fast-xml-parser vulnerable to Regex Injection via Doctype Entities - CVE-2023-34104
• fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name - CVE-2023-26920
• fast-xml-parser vulnerable to ReDOS at currency parsing - CVE-2024-41818
• fast-xml-parser regex vulnerability patch could be improved from a safety perspective - Vulnerability

Tags:

npm

fast-xml-parser