CVE-2026-33180 is a critical-severity security vulnerability in ca.uhn.hapi.fhir:org.hl7.fhir.utilities (maven), affecting versions < 6.9.0. It is fixed in 6.9.0.
Impact 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. Patches This issue has been patched in release 6.8.3 Workarounds None.
CVE-2026-33180 has a CVSS score of 9.8 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (6.9.0). Upgrading removes the vulnerable code path.
maven
ca.uhn.hapi.fhir:org.hl7.fhir.utilities (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.convertors (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.model (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.r4 (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.r4b (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.r5 (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.validation (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli (< 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.utilities → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.convertors → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.model → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.r4 → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.r4b → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.r5 → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.validation → 6.9.0 (maven)ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli → 6.9.0 (maven)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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Upgrade the following packages to resolve this vulnerability:
ca.uhn.hapi.fhir:org.hl7.fhir.utilities to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.convertors to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu2 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu3 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.model to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.r4 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.r4b to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.r5 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.validation to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.validation.cli to 6.9.0 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-33180 is a critical-severity security vulnerability in ca.uhn.hapi.fhir:org.hl7.fhir.utilities (maven), affecting versions < 6.9.0. It is fixed in 6.9.0.
CVE-2026-33180 has a CVSS score of 9.8 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
ca.uhn.hapi.fhir:org.hl7.fhir.utilities (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.convertors (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.model (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.r4 (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.r4b (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.r5 (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) (versions < 6.9.0)ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli (maven) (versions < 6.9.0)Yes. CVE-2026-33180 is fixed in 6.9.0. Upgrade to this version or later.
Whether CVE-2026-33180 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
ca.uhn.hapi.fhir:org.hl7.fhir.utilities to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.convertors to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu2 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu3 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.model to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.r4 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.r4b to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.r5 to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.validation to 6.9.0 or laterca.uhn.hapi.fhir:org.hl7.fhir.validation.cli to 6.9.0 or later