HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint
Published Jul 16, 2026
7.5
HIGHCVSS 3.1
EPSS 0.68%
Description
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.
Affected products
-
- Version < 6.9.7StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Hapifhir | Org.hl7.fhir.core | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Jul 18, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Jun–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.68% (0.00684) | 50.89th | v5 (v2026.06.15) |
| Jul 17, 2026 | 0.49% (0.00489) | 38.83th | v5 (v2026.06.15) |
| Jun 12, 2026 | 0.09% (0.00086) | 24.94th | v4 (v2025.03.14) |
References (7)
- https://github.com/advisories/GHSA-3653-68v6-rq57 Advisory
- https://github.com/hapifhir/org.hl7.fhir.core/commit/275d015c680ce9f90cbe285596e50118e472bf24 x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/commit/e08982d2b6f6dcd6c670a762d9cf999179fbe4ed x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/pull/2403 x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/pull/2463 x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.7 x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3653-68v6-rq57 x_refsource_CONFIRM
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-3653-68v6-rq57 | Advisory | |
| https://github.com/hapifhir/org.hl7.fhir.core/commit/275d015c680ce9f90cbe285596e50118e472bf24 | x_refsource_MISC | |
| https://github.com/hapifhir/org.hl7.fhir.core/commit/e08982d2b6f6dcd6c670a762d9cf999179fbe4ed | x_refsource_MISC | |
| https://github.com/hapifhir/org.hl7.fhir.core/pull/2403 | x_refsource_MISC | |
| https://github.com/hapifhir/org.hl7.fhir.core/pull/2463 | x_refsource_MISC | |
| https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.7 | x_refsource_MISC | |
| https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3653-68v6-rq57 | x_refsource_CONFIRM |
Change history (0)
No recorded changes yet.