hapifhir HAPI FHIR up to 6.9.10 JSON utility parser org.hl7.fhir.utilities.json.parser.JsonParser readArray/readObject input validation

Summaryinfo

A vulnerability marked as problematic has been reported in hapifhir HAPI FHIR up to 6.9.10. The impacted element is the function readArray/readObject of the file org.hl7.fhir.utilities.json.parser.JsonParser of the component JSON utility parser. This manipulation causes input validation. This vulnerability is tracked as CVE-2026-62295. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in hapifhir HAPI FHIR up to 6.9.10. It has been declared as problematic. Affected by this vulnerability is the function readArray/readObject of the file org.hl7.fhir.utilities.json.parser.JsonParser of the component JSON utility parser. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-62295 since 07/13/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 6.9.11 eliminates this vulnerability.

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Productinfo

Vendor

• hapifhir

Name

• HAPI FHIR

Version

• 6.9.0
• 6.9.1
• 6.9.2
• 6.9.3
• 6.9.4
• 6.9.5
• 6.9.6
• 6.9.7
• 6.9.8
• 6.9.9
• 6.9.10

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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