Skip to content
CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-26278

fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

NaturalIntelligence fast-xml-parser

  • >= 5.0.0, < 5.3.6affected
  • >= 4.1.3, < 4.5.4affected

References