CVE-2026-81875 - HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service

CVE-2026-81875 - HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service

https://cvefeed.io/rssfeed/latest.atom / Wed, 09/16/2026 - 22:32
CVE ID :CVE-2026-81875
Published : Sept. 16, 2026, 6:44 p.m. | 23 minutes ago
Description :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.
Severity: 0.0 | NA
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