Uncontrolled Recursion in FHIR - CVE-2026-62296
Published: July 14, 2026
Vulnerability identifier: #VU137479
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-62296
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the XhtmlParser XHTML narrative parser when parsing deeply nested text.div narrative content. A remote attacker can submit a specially crafted FHIR JSON or XML resource to cause a denial of service.
This affects validator services and applications that parse attacker-supplied FHIR resources containing narratives.
Affected software
FHIR
How to mitigate CVE-2026-62296
Install security update from vendor's website.
FHIR - update to 6.9.11