{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-81875","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-27T17:48:42.121Z","datePublished":"2026-09-16T18:44:47.591Z","dateUpdated":"2026-09-17T16:14:31.374Z"},"containers":{"cna":{"title":"HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service","problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-409","lang":"en","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3w98-rrpr-fprr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3w98-rrpr-fprr"},{"name":"https://github.com/hapifhir/org.hl7.fhir.core/pull/2493","tags":["x_refsource_MISC"],"url":"https://github.com/hapifhir/org.hl7.fhir.core/pull/2493"},{"name":"https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f","tags":["x_refsource_MISC"],"url":"https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f"},{"name":"https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.11","tags":["x_refsource_MISC"],"url":"https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.11"},{"name":"https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.12","tags":["x_refsource_MISC"],"url":"https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.12"}],"affected":[{"vendor":"hapifhir","product":"org.hl7.fhir.core","versions":[{"version":"< 6.9.12","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-16T18:44:47.591Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-3w98-rrpr-fprr","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3w98-rrpr-fprr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T16:14:08.266567Z","id":"CVE-2026-81875","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-17T16:14:31.374Z"}}]}}