CVE-2026-55470

Q: How do I fix CVE-2026-55470?

Upgrade hl7 fhir core to 6.9.10 or later.

Q: Is CVE-2026-55470 being actively exploited?

Not that we know of. CVE-2026-55470 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.45% is the estimated probability that it will be exploited in the next 30 days. That is higher than 37% of all scored CVEs.

Q: How severe is CVE-2026-55470?

CVE-2026-55470 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-55470 affect?

Published advisories record a fix for hl7 fhir core (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

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.

CWE-1333

How to fix

Remediation Available

hl7 fhir coreNVD

Affected:< 6.9.10Fixed in:6.9.10CVE-2026-55470derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.45%probability of exploitation in 30 days

37thpercentile

Low risk: more likely to be exploited than 37% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-1333 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-3364	High	7.5	44%	-	Fix
CVE-2024-8124	High	7.5	40%	-	Fix
CVE-2024-25126	Medium	5.3	35%	-	Fix
CVE-2024-2651	Medium	6.5	33%	-	Fix
CVE-2021-32837	High	7.5	29%	-	Fix
CVE-2024-2829	High	7.5	26%	-	Fix

Common questions

How do I fix CVE-2026-55470?

Upgrade hl7 fhir core to 6.9.10 or later.

Is CVE-2026-55470 being actively exploited?

Not that we know of. CVE-2026-55470 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.45% is the estimated probability that it will be exploited in the next 30 days. That is higher than 37% of all scored CVEs.

How severe is CVE-2026-55470?

CVE-2026-55470 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-55470 affect?

Published advisories record a fix for hl7 fhir core (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-55470

Markdown

[![CVE-2026-55470](https://tridentstack.com/cve/badge/CVE-2026-55470.svg)](https://tridentstack.com/cve/CVE-2026-55470)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-55470"><img src="https://tridentstack.com/cve/badge/CVE-2026-55470.svg" alt="CVE-2026-55470"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-16.