CVE-2026-81876

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Source
https://cve.org/CVERecord?id=CVE-2026-81876
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81876.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-81876
Aliases
Published
2026-09-16T18:48:05Z
Modified
2026-09-19T08:01:53Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
HAPI FHIR: SHCParser DEFLATE infinite loop causes denial of service
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 enter an infinite loop while processing attacker-controlled Smart Health Card JWT content whose header contains zip: "DEF" and whose raw-DEFLATE payload is empty or truncated. SHCParser.decodeJWT() reaches SHCParser.inflate(), where Inflater.inflate() can return zero while Inflater.finished() remains false and Inflater.needsInput() is true. The loop also lacks an Inflater.needsDictionary() termination check, SHCParser.decompress() contains the same zero-progress pattern, and ResourceChecker.java can reach SHC parsing during file-format detection. A malformed validation request can pin a JVM worker thread indefinitely, and concurrent requests can exhaust all validation workers. This issue is fixed in version 6.9.12.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-20",
        "CWE-400",
        "CWE-835"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81876.json"
}
References

Affected packages

Git / github.com/hapifhir/org.hl7.fhir.core

Affected ranges

Type
GIT
Repo
https://github.com/hapifhir/org.hl7.fhir.core
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d804558bd77372b1629e55a5b901cad3f5134cdc
Fixed
edd5d8c139e669e39270785f08be7b63aefef24c
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "6.9.12"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

6.*
6.7.11
6.8.1
6.8.2
6.9.0
6.9.1
6.9.10
6.9.2
6.9.3
6.9.4
6.9.5
6.9.6
6.9.7
6.9.8
6.9.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81876.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "136091072841199814584600333235394192435",
                "165379091231531327191037505422476647305",
                "198789399721221590355629323650232563440",
                "275816897020629936955594082648943964674"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-81876-3a98afaf",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/edd5d8c139e669e39270785f08be7b63aefef24c",
        "target": {
            "file": "org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "18839149240940587579755882218920224579",
            "length": 417
        },
        "id": "CVE-2026-81876-420bfe02",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/d804558bd77372b1629e55a5b901cad3f5134cdc",
        "target": {
            "file": "org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java",
            "function": "inflate"
        }
    },
    {
        "deprecated": false,
        "digest": {
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                "323769006251843390073409154618969666238"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-81876-518cfb29",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/d804558bd77372b1629e55a5b901cad3f5134cdc",
        "target": {
            "file": "org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "100455929716093015251610219707593334546",
            "length": 411
        },
        "id": "CVE-2026-81876-88364606",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/edd5d8c139e669e39270785f08be7b63aefef24c",
        "target": {
            "file": "org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java",
            "function": "decompress"
        }
    }
]
vanir_signatures_modified 
"2026-09-19T08:01:53Z"