{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63421",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-16T19:20:28.988Z",
        "datePublished": "2026-08-21T20:15:16.459Z",
        "dateUpdated": "2026-08-26T17:39:12.659Z"
    },
    "containers": {
        "cna": {
            "title": "Keystone: `graphql.maxTake` bypass with negative `take`",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-20",
                            "lang": "en",
                            "description": "CWE-20: Improper Input Validation",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-480",
                            "lang": "en",
                            "description": "CWE-480: Use of Incorrect Operator",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh"
                },
                {
                    "name": "https://github.com/keystonejs/keystone/pull/9859",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/keystonejs/keystone/pull/9859"
                },
                {
                    "name": "https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1"
                },
                {
                    "name": "https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3"
                }
            ],
            "affected": [
                {
                    "vendor": "keystonejs",
                    "product": "keystone",
                    "versions": [
                        {
                            "version": "< 6.5.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-21T20:15:16.459Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Keystone is a content management system for Node.js. Prior to 6.5.3, the findMany resolver in packages/core/src/lib/core/queries/resolvers.ts compares the signed take argument directly with graphql.maxTake, allowing a remote unauthenticated GraphQL client to provide a negative take value whose magnitude exceeds the configured bound. The bypass also applies to relationship queries and can return more records than the developer intended, potentially exhausting service resources. This issue is fixed in version 6.5.3."
                }
            ],
            "source": {
                "advisory": "GHSA-cqmq-8755-7xvh",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-26T17:39:02.487794Z",
                                "id": "CVE-2026-63421",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-26T17:39:12.659Z"
                }
            }
        ]
    }
}