HAPI FHIR HTTP authentication leak in redirects

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-33180: 0.27% estimated exploitation activity in the next 30 days; percentile 19.95 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

18 Mar 2026, 20:07 UTC

Last modified by the source

25 Mar 2026, 18:12 UTC

Source last checked

26 Oct 2026, 16:44 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-p7m9-v2cm-2h7m

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# Patch Next advisory brief: CVE-2026-33180

Advisory: HAPI FHIR HTTP authentication leak in redirects
IDs: CVE-2026-33180, GHSA-p7m9-v2cm-2h7m
Record: https://patchnext.com/advisories/cve-2026-33180 (revision 1, source checked 26 Oct 2026, 16:44 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.convertors 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.validation 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.r4b 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.model 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.utilities 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.r4 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 6.9.0; ca.uhn.hapi.fhir:org.hl7.fhir.r5 6.9.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.convertors: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu3: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.validation: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.r4b: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.model: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.utilities: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.r4: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2: affected < 6.9.0; fixed in 6.9.0
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.r5: affected < 6.9.0; fixed in 6.9.0

## Suggested inspection (read-only)
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.convertors: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu3: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.validation: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.r4b: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.model: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.utilities: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.r4: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2: check the installed version with your package manager.
- Maven ca.uhn.hapi.fhir:org.hl7.fhir.r5: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli, ca.uhn.hapi.fhir:org.hl7.fhir.convertors, ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may, ca.uhn.hapi.fhir:org.hl7.fhir.dstu3, ca.uhn.hapi.fhir:org.hl7.fhir.validation, ca.uhn.hapi.fhir:org.hl7.fhir.r4b, ca.uhn.hapi.fhir:org.hl7.fhir.model, ca.uhn.hapi.fhir:org.hl7.fhir.dstu3.support, ca.uhn.hapi.fhir:org.hl7.fhir.utilities, ca.uhn.hapi.fhir:org.hl7.fhir.r4, ca.uhn.hapi.fhir:org.hl7.fhir.dstu2, ca.uhn.hapi.fhir:org.hl7.fhir.r5.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-p7m9-v2cm-2h7m (GitHub-reviewed advisory GHSA-p7m9-v2cm-2h7m lists affected ranges: Maven ca.uhn.hapi.fhir:org.hl7.fhir.utilities >=0 =0 =0 =0 =0 =0 =0 <6.9.0; Maven…)

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