CVE-2026-73569
fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits
fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.
| CWE | CWE-776 |
| Vendor | naturalintelligence |
| Product | fast-xml-parser |
| Published | Aug 13, 2026 |
| Last Updated | Aug 13, 2026 |
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