What’s Vulnerable › Vulnerabilities

CVE-2026-45367: HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-10-24
• Weakness: CWE-1333

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.

Affected products

• hapifhir org.hl7.fhir.core: before 6.9.7

References

• https://github.com/hapifhir/org.hl7.fhir.core/commit/275d015c680ce9f90cbe285596e50118e472bf24
• https://github.com/hapifhir/org.hl7.fhir.core/commit/e08982d2b6f6dcd6c670a762d9cf999179fbe4ed
• https://github.com/hapifhir/org.hl7.fhir.core/pull/2403
• https://github.com/hapifhir/org.hl7.fhir.core/pull/2463
• https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.7
• https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3653-68v6-rq57

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