GHSA-gq9c-wmrm-5hvr: HAPI FHIR: SHCParser DEFLATE infinite loop causes denial of service
HIGHHigh-risk vulnerability — CVSS 7.5
### Summary A malformed Smart Health Card (SHC) JWT with `zip: "DEF"` and an empty or truncated DEFLATE payload causes `SHCParser.inflate()` to loop forever. This allows an attacker who can submit SHC content for validation to pin a JVM worker thread indefinitely, causing denial of service. ### Details The vulnerable code is in `org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java`. …
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