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    "cveMetadata": {
        "cveId": "CVE-2026-126792",
        "assignerOrgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
        "state": "PUBLISHED",
        "assignerShortName": "mongodb",
        "dateReserved": "2026-11-11T19:27:38.930Z",
        "datePublished": "2026-11-12T23:53:12.989Z",
        "dateUpdated": "2026-11-12T23:53:12.989Z"
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                "shortName": "mongodb",
                "dateUpdated": "2026-11-12T23:53:12.989Z"
            },
            "title": "Heap overflow via oversized RSA signature in GCP KMS signing callback",
            "problemTypes": [
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                    "descriptions": [
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                            "lang": "en",
                            "cweId": "CWE-787",
                            "description": "CWE-787: Out-of-bounds Write",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "MongoDB",
                    "product": "Libmongocrypt Driver",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.1.0",
                            "lessThanOrEqual": "1.21.2",
                            "versionType": "python"
                        }
                    ],
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                    "lang": "en",
                    "value": "A memory-safety flaw in the key-management request-building component of the library can lead to an out-of-bounds write on the heap. A fixed-size output buffer is used under an assumption about cryptographic key size that is never validated, so when the library is embedded by a caller that supplies its own cryptographic callback implementation, data larger than the buffer can be written past its end. Exploitation requires the ability to control the embedding application's in-process key-management provider configuration, a high-privilege position. The demonstrated impact is memory corruption resulting in abnormal termination of the client process.",
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                            "value": "A memory-safety flaw in the key-management request-building component of the library can lead to an out-of-bounds write on the heap. A fixed-size output buffer is used under an assumption about cryptographic key size that is never validated, so when the library is embedded by a caller that supplies its own cryptographic callback implementation, data larger than the buffer can be written past its end. Exploitation requires the ability to control the embedding application's in-process key-management provider configuration, a high-privilege position. The demonstrated impact is memory corruption resulting in abnormal termination of the client process."
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://jira.mongodb.org/browse/MONGOCRYPT-975"
                },
                {
                    "url": "https://jira.mongodb.org/browse/PYTHON-5999"
                }
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                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "HIGH",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "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",
                        "version": "4.0",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 5.6,
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                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "LOW",
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                "discovery": "UNKNOWN"
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