hapifhir HAPI FHIR up to 6.9.10 Xhtml Parser XhtmlParser.java parseElementInner input validation

Summaryinfo

A vulnerability, which was classified as problematic, has been found in hapifhir HAPI FHIR up to 6.9.10. Affected by this vulnerability is the function parseElementInner of the file XhtmlParser.java of the component Xhtml Parser. The manipulation leads to input validation. This vulnerability is documented as CVE-2026-62296. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in hapifhir HAPI FHIR up to 6.9.10. This issue affects the function parseElementInner of the file XhtmlParser.java of the component Xhtml Parser. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is 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, 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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-62296 since 07/13/2026. The exploitation is known to be easy. The attack may be initiated 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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