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Vulnerabilities CVE-2026-62296

CVE-2026-62296

High
Open
TLP:CLEAR

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

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Description

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.

Details

CVSS Score
7.5
EPSS Score
0.28%

20.2th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Aug 7, 2026
Last Modified
Aug 10, 2026
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