CVE-2026-45367
Published:July 16, 2026
Updated:July 21, 2026
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.
Affected Packages
ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (JAVA):
Affected version(s) >=0.0.1 <6.9.7Fix Suggestion:
Update to version 6.9.7ca.uhn.hapi.fhir:org.hl7.fhir.r5 (JAVA):
Affected version(s) >=0.0.1 <6.9.7Fix Suggestion:
Update to version 6.9.7ca.uhn.hapi.fhir:org.hl7.fhir.validation (JAVA):
Affected version(s) >=0.0.1 <6.9.7Fix Suggestion:
Update to version 6.9.7ca.uhn.hapi.fhir:org.hl7.fhir.r4 (JAVA):
Affected version(s) >=0.0.1 <6.9.7Fix Suggestion:
Update to version 6.9.7ca.uhn.hapi.fhir:org.hl7.fhir.r4b (JAVA):
Affected version(s) >=5.6.22 <6.9.7Fix Suggestion:
Update to version 6.9.7ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 (JAVA):
Affected version(s) >=0.0.1 <6.9.7Fix Suggestion:
Update to version 6.9.7ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may (JAVA):
Affected version(s) >=0.0.1 <6.9.7Fix Suggestion:
Update to version 6.9.7Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Regular Expression Complexity
EPSS
Base Score:
0.49