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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-33806",
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "state": "PUBLISHED",
        "assignerShortName": "openjs",
        "dateReserved": "2026-03-23T19:48:48.715Z",
        "datePublished": "2026-04-15T00:14:02.376Z",
        "dateUpdated": "2026-04-15T00:14:02.376Z"
    },
    "containers": {
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                "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
                "shortName": "openjs",
                "dateUpdated": "2026-04-15T00:14:02.376Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Impact:\n\nFastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.\n\nThis is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442\n\nPatches:\n\nUpgrade to fastify v5.8.5 or later.\n\nWorkarounds:\n\nNone. Upgrade to the patched version.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "Impact:\n\nFastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.\n\nThis is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442\n\nPatches:\n\nUpgrade to fastify v5.8.5 or later.\n\nWorkarounds:\n\nNone. Upgrade to the patched version."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "fastify",
                    "product": "fastify",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "5.3.2",
                            "lessThan": "5.8.5"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "5.8.5"
                        }
                    ],
                    "packageURL": "pkg:npm/fastify"
                }
            ],
            "references": [
                {
                    "url": "https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc"
                },
                {
                    "url": "https://cna.openjsf.org/security-advisories.html"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "mcollina"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "climba03003"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "jsumners"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "UlisesGascon"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Vyntral"
                }
            ],
            "title": "fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header",
            "metrics": [
                {
                    "format": "CVSS",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1287",
                            "lang": "en",
                            "description": "CWE-1287: Improper Validation of Specified Type of Input",
                            "type": "CWE"
                        }
                    ]
                }
            ],
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}