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CVE-2026-62296
Published:August 07, 2026
Updated:September 01, 2026
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 Packages
https://github.com/hapifhir/org.hl7.fhir.core.git (GITHUB):
Affected version(s) >=v4.0.0 <6.9.11
Fix Suggestion:
Update to version 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.r5 (JAVA):
Affected version(s) >=0.0.1 <6.9.11
Fix Suggestion:
Update to version 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.utilities (JAVA):
Affected version(s) >=0.0.1 <6.9.11
Fix Suggestion:
Update to version 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.validation (JAVA):
Affected version(s) >=0.0.1 <6.9.11
Fix Suggestion:
Update to version 6.9.11
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Input Validation
Uncontrolled Resource Consumption
Uncontrolled Recursion
EPSS
Base Score:
0.28