Answer in brief
CVE-2026-81875 records a High severity (CVSS 7.5) vulnerability in HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service. The current sources do not mark it as known exploited. The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.r5 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.r5 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps hapifhir/org.hl7.fhir.core (generic), ca.uhn.hapi.fhir:org.hl7.fhir.r5 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.r5 (maven), ca.uhn.hapi.fhir:org.hl7.fhir.validation (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| hapifhir/org.hl7.fhir.coregeneric | <6.9.12 | 6.9.12 |
| ca.uhn.hapi.fhir:org.hl7.fhir.r5maven | <=6.9.11 | 6.9.12 |
| ca.uhn.hapi.fhir:org.hl7.fhir.r5maven | >=0 <6.9.12 | 6.9.12 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validationmaven | <=6.9.11 | 6.9.12 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validationmaven | >=0 <6.9.12 | 6.9.12 |
| ca.uhn.hapi.fhir:org.hl7.fhir.validation.climaven | <=5.0.0 | Not reported |
| ca.uhn.hapi.fhir:org.hl7.fhir.validation.climaven | >=0 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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 consume attacker-controlled Smart Health Card JWT content whose header contains zip: "DEF" and whose small raw-DEFLATE payload expands to a very large value. SHCParser.decodeJWT() passes the decoded payload to SHCParser.inflate(), which accumulates all decompressed bytes in a ByteArrayOutputStream without an output-size limit before JSON parsing, and SHCParser.decompress() contains the same unbounded pattern. An application or validator service that accepts attacker-supplied SHC content can therefore suffer excessive heap allocation, severe garbage-collection pressure, request failure, process instability, or process termination. This issue is fixed in version 6.9.12.
Quoted source text, attributed separately from HOL analysis.