CVE-2026-81875

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Source

https://cve.org/CVERecord?id=CVE-2026-81875

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81875.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-81875

Aliases

GHSA-3w98-rrpr-fprr

Published

2026-09-16T18:44:47Z

Modified

2026-09-19T08:01:10Z

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 unbounded DEFLATE decompression 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 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.

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"
}

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

Fixed

fbb94216e0ad21ded75be77e5e20242ba194e83f

Fixed

6a8b9c0c679411132054d835dbc68d545fa51c8a

Fixed

73c432b5f43ddbce979978a760ec4aa81e929094

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

6.9.11

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-2026-81875.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "270649621876696143585358143332013269034",
                "307892693416071557266515365908284793217",
                "54879530773635472201207678283655817534",
                "84021881232008337835622545171829028370",
                "65242139337513549248086294120713014474",
                "185796640932900532588199885332589907024",
                "164603120793886826392620409881596535372",
                "120890545209676172566315111849401643512",
                "285586865335368357867612918643443410670",
                "212239312504723230357186776588412418373",
                "228595268962160250866556123706075197999",
                "144258297068424094173059164250449092988",
                "109399536684256180734028813651575450140",
                "282029182900380331643234529973606064369",
                "16752435173001471838002191453344239641",
                "270642931110960844567643368238594343338",
                "139439637410077312726798664826096732243",
                "314302683238419643528460630569420103115",
                "154254562073957365433018101046905731757",
                "270227046638145437860691749461677268409",
                "143211294177456742559246296125635374020",
                "186238144257488852484231656490706672667"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-81875-655fca3a",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f",
        "target": {
            "file": "org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "173729588206513549525792628885476679322",
                "146667835513553437516490657245974409381",
                "265534804110698273795437748539356473402",
                "57242729054995514972477277530258045307",
                "240157958087720169153589035075611144510",
                "58449568961175096323452631060318427803",
                "184802323842191539815893423807953779687"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-81875-a0aa98fc",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f",
        "target": {
            "file": "org.hl7.fhir.r5/src/test/java/org/hl7/fhir/r5/elementmodel/SHCParserTests.java"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "334201967276274627600813832646820228703",
            "length": 484
        },
        "id": "CVE-2026-81875-b495b229",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/hapifhir/org.hl7.fhir.core/commit/fbb94216e0ad21ded75be77e5e20242ba194e83f",
        "target": {
            "file": "org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java",
            "function": "inflate"
        }
    }
]

vanir_signatures_modified

"2026-09-19T08:01:10Z"