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CVE-2026-62296
7.5 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created & dismissed (no matching packages found) suggestion
HAPI FHIR: XHTML narrative parser unbounded recursion causes StackOverflow denial of service
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.
References
Affected products
org.hl7.fhir.core
- ==< 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.r5
- ==< 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.utilities
- ==< 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.validation
- ==< 6.9.11
ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli
- ==< 6.9.11