CVE-2026-73569
Description
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.
How to fix
- fast-xml-parser5.10.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fast-xml-parsernpm | 5.9.3 ≤ v < 5.10.1 | 5.10.1 |
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