CVE-2026-45367 Details
Description
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.
A denial-of-service vulnerability has been identified in the HAPI FHIR library, specifically within the FHIRPathEngine component. This issue affects versions through 6.9.6 of the HAPI FHIR libraries for FHIR DSTU2, DSTU3, R4, R4B, and R5. The vulnerability arises because the FHIRPath functions 'matches()', 'matchesFull()', and 'replaceMatches()' allow users to pass arbitrary regular expressions directly to Java's regex engine without any validation or time constraints. This oversight can be exploited by sending a resource with a malicious regex that causes catastrophic backtracking, leading to excessive resource consumption and a denial-of-service condition.
Users can upgrade to HAPI FHIR version 6.9.7 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 18, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1333 | Inefficient Regular Expression Complexity | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 18, 2026 | CVE Modified | CISA-ADP |
| Jul 16, 2026 | New CVE Received | [email protected] |