CVE-2026-49485 high CVSS 7.5

Vulnerability in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (CVE-2026-49485)

Summary

Vulnerability in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (CVE-2026-49485). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 6.9.4.2 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 6.9.9 and 6.9.4.2, all implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation, and the FHIRPath functions matches(), matchesFull(), and replaceMatches() pass user-controlled regular expressions to Java's Pattern.compile() and String.replaceAll() through an incomplete timeout utility. An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting CPU resources and causing denial of service in the FHIR Validator HTTP endpoint and affected org.hl7.fhir.* modules. This issue is fixed in versions 6.9.9 and 6.9.4.2.

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-2026-49485 has been found in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.
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 6.9.4.2 or later.
If unsure, ask your IT team or search "ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 CVE-2026-49485" on the vendor's site.

CVE-2026-49485 (ca.uhn.hapi.fhir:org.hl7.fhir.dstu2) — CWE-1333 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 6.9.4.2 — 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.

❓ What is the problem

A vulnerability (CWE-1333) exists in ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.

📍 Affected scope

Check the vendor advisory for the affected versions of ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 6.9.4.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

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

1
Identify 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。
2
Apply patch patch
```
Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 to 6.9.4.2
```
ステージング環境で 6.9.4.2 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。
3
Post-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。