{"cve":"CVE-2026-55470","nvd":{"published":"2026-07-08T22:17:15.377","modified":"2026-10-25T17:10:00.197","status":"Analyzed","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1333"],"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"],"products":["hapifhir:hl7_fhir_core"],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-55470","score":0.0068,"percentile":0.52128,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-fxj4-p9xp-37v5","url":"https://osv.dev/vulnerability/GHSA-fxj4-p9xp-37v5","summary":"HAPI FHIR: Incomplete fix for CVE-2026-45367: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS","modified":"2026-06-17T19:11:27.800538Z","packages":[{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu2","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.dstu2","ranges":["<6.9.10"],"fixed":["6.9.10"]},{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.convertors","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.convertors","ranges":["<6.9.10"],"fixed":["6.9.10"]},{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.validation","ranges":["<6.9.10"],"fixed":["6.9.10"]},{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.validation.cli","ranges":["<6.9.10"],"fixed":["6.9.10"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}