{"cve":"CVE-2026-81875","nvd":{"published":"2026-09-16T19:17:44.250","modified":"2026-09-30T17:43:24.057","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-20","CWE-400","CWE-409"],"references":["https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f","https://github.com/hapifhir/org.hl7.fhir.core/pull/2493","https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.11","https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.12","https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3w98-rrpr-fprr"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-81875","score":0.0063,"percentile":0.49889,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-3w98-rrpr-fprr","url":"https://osv.dev/vulnerability/GHSA-3w98-rrpr-fprr","summary":"HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service","modified":"2026-09-17T20:45:05.295312533Z","packages":[{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.r5","ranges":["<6.9.12"],"fixed":["6.9.12"]},{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.validation","ranges":["<6.9.12"],"fixed":["6.9.12"]},{"ecosystem":"Maven","name":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.validation.cli","ranges":["<=5.0.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}