CVE-2026-55470
HIGHHAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5
X_Refsource_Misc x_refsource_misc
https://github.com/hapifhir/org.hl7.fhir.core/commit/56376f7986222626af061ca7fc27ee1ab030e590
X_Refsource_Misc x_refsource_misc
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10
Scores
CVSS v3
7.5
EPSS
0.0044
EPSS Percentile
36.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-1333
Status
published
Products (2)
hapifhir/hl7_fhir_core
< 6.9.10
hapifhir/org.hl7.fhir.core
< 6.9.10
Published
Jul 08, 2026
Tracked Since
Jul 09, 2026