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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-55470

32
FAUCET Score

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.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 6.9.10CPE matchmatch criteria
cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
36.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 15th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: ca.uhn.hapi.fhir:org.hl7.fhir.dstu2Fixed in: 6.9.10
mavenpatch availablevia ghsa
Product: ca.uhn.hapi.fhir:org.hl7.fhir.convertorsFixed in: 6.9.10
mavenpatch availablevia ghsa
Product: ca.uhn.hapi.fhir:org.hl7.fhir.validationFixed in: 6.9.10
mavenpatch availablevia ghsa
Product: ca.uhn.hapi.fhir:org.hl7.fhir.validation.cliFixed in: 6.9.10

Vendor Advisories (1)

mavenGHSA-fxj4-p9xp-37v5high

HAPI FHIR: Incomplete fix for CVE-2026-45367: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS

Jun 17, 2026

References

github.com / hapifhir/org.hl7.fhir.core/commit/56376f7986222626af061ca7fc27ee1ab030e590
Patch
github.com / hapifhir/org.hl7.fhir.core/releases/tag/6.9.10
Release Notes
github.com / hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fxj4-p9xp-37v5
ExploitThird Party Advisory