Vulnerability in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (CVE-2026-55470)
Summary
Vulnerability in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (CVE-2026-55470). Risk of unauthorized operations or information disclosure. Exploitable via RegexTimeout. Mitigation: upgrade to 6.9.10 or later.
Original description
The description as published by the source.
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: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-55470 has been found in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.
Attackers can target a specific entry point like RegexTimeout over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 to 6.9.10 or later.
If unsure, ask your IT team or search "ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 CVE-2026-55470" on the vendor's site.
CVE-2026-55470 (ca.uhn.hapi.fhir:org.hl7.fhir.dstu2) — CWE-1333 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: RegexTimeout / org.hl7.fhir.dstu2 / FHIRPathEngine
Patched: 6.9.10 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-1333) exists in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2. Attackers reach the vulnerable code path via RegexTimeout without authentication.
Check the vendor advisory for the affected versions of ca.uhn.hapi.fhir:org.hl7.fhir.dstu2. Attack surface: RegexTimeout / org.hl7.fhir.dstu2 / FHIRPathEngine.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 6.9.10.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 to 6.9.10ステージング環境で 6.9.10 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- web github.com
- web github.com