Bug 2449841 (CVE-2026-33180)

Summary:	CVE-2026-33180 HAPI FHIR: hapifhir/org.hl7.fhir.core: HAPI FHIR: Information disclosure and potential impersonation via HTTP redirects sending sensitive headers
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	gmalinko, janstey, pdelbell, rstepani
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in HAPI FHIR, a Java implementation of the HL7 FHIR standard. When the internal HTTP client follows redirects (HTTP 30X response codes), it can inadvertently send sensitive HTTP headers, such as authentication tokens, to unintended third-party hosts. This information disclosure could allow a remote attacker to gain unauthorized access or impersonate the client's requests, potentially compromising sensitive data.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-03-20 23:03:16 UTC

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.0, when setting headers in HTTP requests, the internal HTTP client sends headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the Location: response header value. Sending the same set of headers to subsequent hosts is a problem as this header often contains privacy sensitive information or data that could allow others to impersonate the  client's request. This issue has been patched in release 6.9.0. No known workarounds are available.