GHSA-8r6m-32jq-jx6q
fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits
Quick fix
GHSA-8r6m-32jq-jx6q — fast-xml-parser: upgrade to the fixed version with the command below.
npm install fast-xml-parser@5.10.1Details
### Impact `fast-xml-parser` processes multiple "DOCTYPE" declarations within a single XML document. Each declaration passes its entities to `@nodable/entities` through `addInputEntities()`.
`addInputEntities()` resets the entity expansion counters every time it is called. An attacker can therefore insert additional DOCTYPE declarations to repeatedly reset maxTotalExpansions and maxExpandedLength during one parse operation.
This allows a crafted XML document to exceed the configured entity-expansion limits and can cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination.
### Workarounds - Manually check if multiple DOCTYPEs are not present in input contents - Update to v5.10.1 - Keep `processEntity` flag off
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Affected packages
References
- https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q [WEB]
- https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f [WEB]
- https://github.com/NaturalIntelligence/fast-xml-parser [PACKAGE]
- https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1 [WEB]