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Advisory record · GHSA-3ww8-jw56-9f5h

FHIR Validator: Unauthenticated Blind SSRF via /loadIG Endpoint Enables Internal Network Probing

CVSS 5.8 MediumEPSS 0.0024 · 15th percentile

Published by the GitHub Advisory Database at 30 Mar 2026, 17:21 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
ca.uhn.hapi.fhir:org.hl7.fhir.coreMaven<6.9.46.9.4
Identifiers
GHSA-3ww8-jw56-9f5h · CVE-2026-34360
Weakness (CWE)
CWE-918
Tags
Published
30 Mar 2026
Updated
31 Mar 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of org.hl7.fhir.core (Maven ca.uhn.hapi.fhir:org.hl7.fhir.core) before 6.9.4 are affected. The /loadIG endpoint of the FHIR Validator HTTP service fetches user-supplied URLs with no host or domain validation and no authentication, so an attacker with network access can make the server send requests to internal hosts and cloud metadata endpoints. The attacker can only infer results from error responses, so the impact is blind network probing rather than content retrieval. Upgrade to version 6.9.4 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.8 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 15th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.