High [CVE-2026-73569] Denial of Service via repeated DOCTYPE declarations
This high-severity Red Hat Linux advisory covers CVE-2026-73569 affecting Migration Toolkit for Applications 8, Red Hat Advanced Cluster Security 4, Red Hat Openshift Data Foundation 4.
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Summary
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.
A remote attacker could exploit this by submitting a specially crafted XML document containing multiple DOCTYPE declarations. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-776. Affected Red Hat products: Migration Toolkit for Applications 8; Red Hat Advanced Cluster Security 4; Red Hat Openshift Data Foundation 4; Red Hat OpenShift GitOps; Red Hat OpenShift Virtualization 4; Self-service automation portal 2.
Red Hat lists Red Hat build of Apicurio Registry 3; Red Hat Developer Hub; Red Hat OpenShift GitOps as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
- 5.9.3
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 5.10.1. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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