CVE-2026-62296
HAPI FHIR: XHTML narrative parser unbounded recursion causes StackOverflow denial of service
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.9.11
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: poc
- Automatable: yes
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: poc · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- hapifhir org.hl7.fhir.core
fixed in 6.9.11
- hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.r5
fixed in 6.9.11
- hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.utilities
fixed in 6.9.11
- hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation
fixed in 6.9.11
- hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli
fixed in 6.9.11