{"id":"CVE-2026-62296","state":"PUBLISHED","title":"HAPI FHIR: XHTML narrative parser unbounded recursion causes StackOverflow denial of service","description":"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.","publishedAt":"2026-08-07T20:03:17.024Z","updatedAt":"2026-08-10T13:29:55.958Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["hapifhir org.hl7.fhir.core","hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.r5","hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.utilities","hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation","hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli"],"affected":[{"vendor":"hapifhir","product":"org.hl7.fhir.core","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.utilities","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","versions":[{"version":"< 6.9.11","status":"affected"}]}],"references":["https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-5v24-q6x8-hc38","https://github.com/hapifhir/org.hl7.fhir.core/commit/396f447500407693d6ae1e64db59782862ca7506"],"weaknesses":["CWE-20","CWE-400","CWE-674"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62296.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62296","state":"PUBLISHED","datePublished":"2026-08-07T20:03:17.024Z","dateUpdated":"2026-08-10T13:29:55.958Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-13T18:37:08.488Z"},"containers":{"cna":{"title":"HAPI FHIR: XHTML narrative parser unbounded recursion causes StackOverflow denial of service","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"hapifhir","product":"org.hl7.fhir.core","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.utilities","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","versions":[{"version":"< 6.9.11","status":"affected"}]},{"vendor":"hapifhir","product":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","versions":[{"version":"< 6.9.11","status":"affected"}]}],"references":[{"url":"https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-5v24-q6x8-hc38","name":"https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-5v24-q6x8-hc38","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/hapifhir/org.hl7.fhir.core/commit/396f447500407693d6ae1e64db59782862ca7506","name":"https://github.com/hapifhir/org.hl7.fhir.core/commit/396f447500407693d6ae1e64db59782862ca7506","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-674","lang":"en","description":"CWE-674: Uncontrolled Recursion","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-07T20:03:17.024Z"},"source":{"advisory":"GHSA-5v24-q6x8-hc38","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-5v24-q6x8-hc38","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-10T13:29:32.888412Z","id":"CVE-2026-62296","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-10T13:29:55.958Z"}}]}}}