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CVE-2026-62296

HAPI FHIR: XHTML narrative parser unbounded recursion causes StackOverflow denial of service PUBLISHED

Description (CNA)

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.11, XhtmlParser.java imposes no maximum element nesting depth, so a deeply nested text.div narrative triggers unbounded recursion between parseElementInner() and parseElement(), raising a StackOverflowError. An attacker who can submit FHIR resources containing such narratives can thus crash a parsing or validation worker thread, affecting validator services and any application that parses attacker-supplied FHIR JSON or XML. This issue is fixed in version 6.9.11.

Affected (CNA)

Vendor / productVersions
hapifhir / org.hl7.fhir.coreaffected < 6.9.11
hapifhir / ca.uhn.hapi.fhir:org.hl7.fhir.r5affected < 6.9.11
hapifhir / ca.uhn.hapi.fhir:org.hl7.fhir.utilitiesaffected < 6.9.11
hapifhir / ca.uhn.hapi.fhir:org.hl7.fhir.validationaffected < 6.9.11
hapifhir / ca.uhn.hapi.fhir:org.hl7.fhir.validation.cliaffected < 6.9.11

CWE

CWE-20, CWE-400, CWE-674

References

ADP enrichment

CISA-ADP

No English description supplied.