Answer in brief
CVE-2026-55470 records a High severity (CVSS 7.5) vulnerability in HAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS. The current sources do not mark it as known exploited. The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.convertors (maven), ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-55470 records a High severity (CVSS 7.5) vulnerability in HAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS. The current sources do not mark it as known exploited. The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.convertors (maven), ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.convertors (maven), ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| hapifhir/org.hl7.fhir.coregeneric | < 6.9.10 | Not reported |
| ca.uhn.hapi.fhir:org.hl7.fhir.convertorsmaven | <=6.9.9 | 6.9.10 |
| ca.uhn.hapi.fhir:org.hl7.fhir.dstu2maven | <=6.9.9 | 6.9.10 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validationmaven | <=6.9.9 | 6.9.10 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validation.climaven | <=6.9.9 | 6.9.10 |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.convertors (maven), ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| hapifhir/org.hl7.fhir.coregeneric | < 6.9.10 | Not reported |
| ca.uhn.hapi.fhir:org.hl7.fhir.convertorsmaven | <=6.9.9 | 6.9.10 |
| ca.uhn.hapi.fhir:org.hl7.fhir.dstu2maven | <=6.9.9 | 6.9.10 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validationmaven | <=6.9.9 | 6.9.10 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validation.climaven | <=6.9.9 | 6.9.10 |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.