HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint — GHSA-3653-68V6-RQ57

Summary

## Summary All implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation. The FHIRPath functions `matches()`, `matchesFull()`, and `replaceMatches()` pass user-controlled regular expressions directly to Java's `Pattern.compile()` and `String.replaceAll()` without complexity checks or timeouts. An attacker can send a resource containing an evil regex pattern…

Timeline

Published by source

2026-05-18

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 7.5 out of 10.
• Reported EPSS value: 0.
• Review exposure for the affected product or family: maven: ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may | maven: ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.r4 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.r4b | maven: ca.uhn.hapi.fhir:org.hl7.fhir.r5 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.validation | maven: ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli.

Product

maven: ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may | maven: ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.r4 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.r4b | maven: ca.uhn.hapi.fhir:org.hl7.fhir.r5 | maven: ca.uhn.hapi.fhir:org.hl7.fhir.validation | maven: ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-3653-68V6-RQ57

Source

GitHub

Vendor

GitHub

Published by source

2026-05-18

Last source activity

2026-05-18

Additional identifiers

CVE-2026-45367

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.