Vulnerability in Hapifhir Org.hl7.fhir.core
CVE-2026-45367
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.007 (49.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Hapifhir Org.hl7.fhir.core — versions < 6.9.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-45367?
- CVE-2026-45367 is a high-severity vulnerability in Hapifhir Org.hl7.fhir.core, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-07-16.
- How severe is CVE-2026-45367?
- High severity. CVSS v3 base score is 7.5 out of 10.