HAPI FHIR: SHCParser DEFLATE infinite loop causes denial of service

Date Sep 17, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product Maven · ca.uhn.hapi.fhir:org.hl7.fhir.r5

CVE CVE-2026-81876

High-risk advisory CVE-2026-81876

Summary

HAPI FHIR: SHCParser DEFLATE infinite loop causes denial of service

Why it matters

GitHub has published a reviewed security advisory for ca.uhn.hapi.fhir:org.hl7.fhir.r5. Prioritize it with other application dependency updates.

Operator check

Check whether ca.uhn.hapi.fhir:org.hl7.fhir.r5 is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-gq9c-wmrm-5hvr NVD — CVE-2026-81876 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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