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    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-104020",
        "assignerOrgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "state": "PUBLISHED",
        "assignerShortName": "AMZN",
        "dateReserved": "2026-10-01T16:57:41.444Z",
        "datePublished": "2026-10-01T20:36:33.967Z",
        "dateUpdated": "2026-10-01T21:07:33.567Z"
    },
    "containers": {
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                "orgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
                "shortName": "AMZN",
                "dateUpdated": "2026-10-01T21:07:33.567Z"
            },
            "title": "Uncontrolled recursion in the Ion reader in Amazon Ion Python",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-674",
                            "description": "CWE-674 Uncontrolled recursion",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-230",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-230 Serialized Data with Nested Payloads"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Amazon",
                    "product": "ion-python",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "0.15.0",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Uncontrolled recursion in the Ion reader in Amazon Ion Python before 0.15.0 might allow a remote unauthenticated actor to crash the application using the library, resulting in a denial of service, via a crafted, deeply nested Ion value.\n\n\n\nTo remediate this issue, users should upgrade to version 0.15.0 or later.",
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                            "value": "<p>Uncontrolled recursion in the Ion reader in Amazon Ion Python before 0.15.0 might allow a remote unauthenticated actor to crash the application using the library, resulting in a denial of service, via a crafted, deeply nested Ion value.</p><p>To remediate this issue, users should upgrade to version 0.15.0 or later.</p>"
                        }
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            ],
            "references": [
                {
                    "url": "https://github.com/amazon-ion/ion-python/releases/tag/v0.15.0",
                    "tags": [
                        "patch"
                    ]
                },
                {
                    "url": "https://aws.amazon.com/security/security-bulletins/2026-122-aws/",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "url": "https://github.com/amazon-ion/ion-python/security/advisories/GHSA-93q6-f8hx-vv7f",
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                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.5,
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                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
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                        "baseScore": 8.7,
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            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "University of Manchester",
                    "type": "finder"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
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}