fast-xml-parser has an entity encoding bypass via regex injection in DOCTYPE entity names

Description

No description available.

Recommendation

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

• Affected version(s): **>= 4.1.3, < 4.5.4

  >= 5.0.0, < 5.3.5**

• Patched version(s): **4.5.4

  5.3.5**

References

• GHSA-m7jm-9gc2-mpf2
• CVE-2026-25896
• CWE-185
• CAPEC-310
• OWASP 2021-A6

Related Issues

• fast-xml-parser vulnerable to Regex Injection via Doctype Entities - CVE-2023-34104
• fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit) - CVE-2026-26278
• fast-xml-parser affected by numeric entity expansion bypassing all entity expansion limits (incomplete fix for CVE-2026- - CVE-2026-33036
• Entity Expansion Limits Bypassed When Set to Zero Due to JavaScript Falsy Evaluation in fast-xml-parser - CVE-2026-33349

Tags:

npm

fast-xml-parser