{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.9.12"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fbb94216e0ad21ded75be77e5e20242ba194e83f"
            },
            {
              "fixed": "6a8b9c0c679411132054d835dbc68d545fa51c8a"
            },
            {
              "fixed": "73c432b5f43ddbce979978a760ec4aa81e929094"
            }
          ],
          "repo": "https://github.com/hapifhir/org.hl7.fhir.core",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-3w98-rrpr-fprr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-20",
      "CWE-400",
      "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81875.json"
  },
  "details": "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.",
  "id": "CVE-2026-81875",
  "modified": "2026-09-19T03:30:54.748994928Z",
  "published": "2026-09-16T18:44:47.591Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.12"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81875.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-3w98-rrpr-fprr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81875"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/pull/2493"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service"
}