HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-49485
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-17 22:17:16 UTC
Updated2026-07-20 15:16:39 UTC
DescriptionHAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.9 and 6.9.4.2, all implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation, and the FHIRPath functions matches(), matchesFull(), and replaceMatches() pass user-controlled regular expressions to Java's Pattern.compile() and String.replaceAll() through an incomplete timeout utility. An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting CPU resources and causing denial of service in the FHIR Validator HTTP endpoint and affected org.hl7.fhir.* modules. This issue is fixed in versions 6.9.9 and 6.9.4.2.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006750000 probability, percentile 0.481770000 (date 2026-07-20)

Problem Types: CWE-400 | CWE-1333 | CWE-1333 CWE-1333: Inefficient Regular Expression Complexity | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Hapifhir Org.hl7.fhir.core affected < 6.9.4.2 Not specified
CNA Hapifhir Org.hl7.fhir.core affected >= 6.9.5, < 6.9.9 Not specified

References

ReferenceSourceLinkTags
github.com/hapifhir/org.hl7.fhir.core/commit/109c88837c032ef399b2eb87ddd... [email protected] github.com
github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.9 [email protected] github.com
github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.4.2 [email protected] github.com
github.com/hapifhir/org.hl7.fhir.core/commit/e08982d2b6f6dcd6c670a762d9c... [email protected] github.com
github.com/hapifhir/org.hl7.fhir.core/pull/2463 [email protected] github.com
github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-7cmj-v6x8... [email protected] github.com
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