CVE-2026-62296HAPI FHIR: XHTML narrative parser unbounded recursion causes StackOverflow denial of service
Updated under an hour ago ()
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It affects hapifhir org.hl7.fhir.core and 4 other products. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.49%, higher than 41% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-20, CWE-400, CWE-674
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.49% (percentile 41)
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
hapifhir org.hl7.fhir.core hapifhir:org.hl7.fhir.core (from the name) | before 6.9.11 | CNA record |
hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.r5 hapifhir:ca.uhn.hapi.fhir_org.hl7.fhir.r5 (from the name) | before 6.9.11 | CNA record |
hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.utilities hapifhir:ca.uhn.hapi.fhir_org.hl7.fhir.utilities (from the name) | before 6.9.11 | CNA record |
hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation hapifhir:ca.uhn.hapi.fhir_org.hl7.fhir.validation (from the name) | before 6.9.11 | CNA record |
hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli hapifhir:ca.uhn.hapi.fhir_org.hl7.fhir.validation.cli (from the name) | before 6.9.11 | CNA record |
References
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-5v24-q6x8-hc38x-refsource-confirm
- https://github.com/hapifhir/org.hl7.fhir.core/commit/396f447500407693d6ae1e64db59782862ca7506x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.