Vulnerability Description
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.11, the JSON utility parser in org.hl7.fhir.utilities.json.parser.JsonParser enforces no maximum nesting depth for arrays or objects. As a result, a small but deeply nested, syntactically valid FHIR JSON document can trigger unbounded readArray() or readObject() recursion, raising a StackOverflowError before structural validation runs. An attacker who can submit JSON resources for validation can thus crash the request thread, and services that do not isolate StackOverflowError safely may experience worker loss or process instability — a denial-of-service condition. 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-2cq7-hg49
FAQ
What is CVE-2026-62295?
CVE-2026-62295 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, the JSON utility parser in org.hl7.fhir.utilities.json.parser.JsonParser enfor...
How severe is CVE-2026-62295?
CVE-2026-62295 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-2026-62295?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.