CVE-2026-81876High· 7.5▾ TwilightHAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.12, SHCParser in org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java can enter an infinit…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.6%
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.12, SHCParser in org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java can enter an infinite loop while processing attacker-controlled Smart Health Card JWT content whose header contains zip: "DEF" and whose raw-DEFLATE payload is empty or truncated. SHCParser.decodeJWT() reaches SHCParser.inflate(), where Inflater.inflate() can return zero while Inflater.finished() remains false and Inflater.needsInput() is true. The loop also lacks an Inflater.needsDictionary() termination check, SHCParser.decompress() contains the same zero-progress pattern, and ResourceChecker.java can reach SHC parsing during file-format detection. A malformed validation request can pin a JVM worker thread indefinitely, and concurrent requests can exhaust all validation workers. This issue is fixed in version 6.9.12.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
ca.uhn.hapi.fhir:org.hl7.fhir.r5 <= 6.9.11ca.uhn.hapi.fhir:org.hl7.fhir.validation <= 6.9.11ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli <= 6.9.11Patched in:
ca.uhn.hapi.fhir:org.hl7.fhir.r5 6.9.12ca.uhn.hapi.fhir:org.hl7.fhir.validation 6.9.12ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli 6.9.12Connected by shared product, vendor, weakness, or advisory.
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