Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/hapifhir/org.hl7.fhir.core/commit/396f447500407693d6ae1e64db5
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-5v24-q6x8
FAQ
What is CVE-2026-62296?
CVE-2026-62296 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-62296?
CVE-2026-62296 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62296?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.