Fluid Attacks Database

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
npm	fast-xml-parser	>=5.9.3 <5.10.1	5.10.1
debian 14	node-webfont	=11.4.0+dfsg2+~cs35.7.26-13 \|\| =11.4.0+dfsg2+~cs35.7.26-14 \|\| =11.4.0+dfsg2+~cs35.7.26-15 \|\| =11.4.0+dfsg2+~cs35.7.26-16 \|\| =11.4.0+dfsg2+~cs35.7.26-18 \|\| =11.4.0+dfsg2+~cs35.7.26-19 \|\| =11.4.0+dfsg2+~cs35.7.26-20 \|\| =11.4.0+dfsg2+~cs35.7.26-21	-
debian 12	node-webfont	=11.4.0+dfsg2+~cs35.7.26-10 \|\| =11.4.0+dfsg2+~cs35.7.26-11 \|\| =11.4.0+dfsg2+~cs35.7.26-12 \|\| =11.4.0+dfsg2+~cs35.7.26-13 \|\| =11.4.0+dfsg2+~cs35.7.26-14 \|\| =11.4.0+dfsg2+~cs35.7.26-15 \|\| =11.4.0+dfsg2+~cs35.7.26-16 \|\| =11.4.0+dfsg2+~cs35.7.26-18 \|\| =11.4.0+dfsg2+~cs35.7.26-19 \|\| =11.4.0+dfsg2+~cs35.7.26-20 \|\| =11.4.0+dfsg2+~cs35.7.26-21 \|\| =11.4.0+dfsg2+~cs35.7.26-7 \|\| =11.4.0+dfsg2+~cs35.7.26-8 \|\| =11.4.0+dfsg2+~cs35.7.26-9	-
debian 13	node-webfont	=11.4.0+dfsg2+~cs35.7.26-13 \|\| =11.4.0+dfsg2+~cs35.7.26-14 \|\| =11.4.0+dfsg2+~cs35.7.26-15 \|\| =11.4.0+dfsg2+~cs35.7.26-16 \|\| =11.4.0+dfsg2+~cs35.7.26-18 \|\| =11.4.0+dfsg2+~cs35.7.26-19 \|\| =11.4.0+dfsg2+~cs35.7.26-20 \|\| =11.4.0+dfsg2+~cs35.7.26-21	-

Aliases

1. CVE-2026-735692. NVD-2026-735693. OSV-2026-735694. OSV-DEBIAN-2026-735695. GHSA-8r6m-32jq-jx6q6. GCVE-2026-735697. SECURITY-TRACKER-CVE-2026-73569

References

1. https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q2. https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f3. https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1

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