CVE-2026-55470
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.10, the fix for CVE-2026-45367 incompletely patched the DSTU2 module, leaving FHIRPathEngine.matches() in org.hl7.fhir.dstu2/utils/FHIRPathEngine.java to call raw String.matches(sw) without RegexTimeout protection while replaceMatches() was updated, allowing an unauthenticated attacker to trigger catastrophic regex backtracking and exhaust server CPU. This issue is fixed in version 6.9.10.
- CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 0.7% chance of exploitation in the next 30 days; higher than 52% of CVEs (scores of 2026-10-25)
- CWE
- CWE-1333
- Published
- Modified
- Record from
- the NVD, synced
Affected
- hapifhir:hl7_fhir_core
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fxj4-p9xp-37v5 | Maven | ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 | <6.9.10 | 6.9.10 |
| GHSA-fxj4-p9xp-37v5 | Maven | ca.uhn.hapi.fhir:org.hl7.fhir.convertors | <6.9.10 | 6.9.10 |
| GHSA-fxj4-p9xp-37v5 | Maven | ca.uhn.hapi.fhir:org.hl7.fhir.validation | <6.9.10 | 6.9.10 |
| GHSA-fxj4-p9xp-37v5 | Maven | ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli | <6.9.10 | 6.9.10 |
References
- https://github.com/hapifhir/org.hl7.fhir.core/commit/56376f7986222626af061ca7fc27ee1ab030e590
- https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5