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CVE-2026-55470— HAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS

Quick assessment

Affected
hapifhir org.hl7.fhir.core
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HAPI FHIR是HAPI FHIR组织开源的一个Java编写的 HL7 FHIR API。 HAPI FHIR 6.9.10之前版本存在资源管理错误漏洞，该漏洞源于正则表达式未设置超时保护，可能导致未经身份验证的攻击者触发灾难性正则回溯并耗尽服务器CPU。

CVSS 7.5 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
hapifhir org.hl7.fhir.core < 6.9.10 affected
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I. Basic Information for CVE-2026-55470

Vulnerability Information
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Vulnerability Title
HAPI FHIR: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
HAPI FHIR 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HAPI FHIR是HAPI FHIR组织开源的一个Java编写的 HL7 FHIR API。 HAPI FHIR 6.9.10之前版本存在资源管理错误漏洞，该漏洞源于正则表达式未设置超时保护，可能导致未经身份验证的攻击者触发灾难性正则回溯并耗尽服务器CPU。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hapifhir org.hl7.fhir.core < 6.9.10 -

II. Public POCs for CVE-2026-55470

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8903 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-55470

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Patches & Fixes for CVE-2026-55470 (1)

Vendor Advisories for CVE-2026-55470 (1)

Vendor Pages for CVE-2026-55470 (1)

IV. Related Vulnerabilities

Same product: org.hl7.fhir.core
Same vendor: hapifhir
Same weakness: CWE-1333

V. Comments for CVE-2026-55470

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