{"id":"CVE-2026-81521","revision":"b954aa6cd70c4b97a2b8e11c3acf9e58","records":[{"revision":"b954aa6cd70c4b97a2b8e11c3acf9e58","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-81521","aliases":[],"title":"Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver","description":"The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.","state":0,"publishedAt":"2026-08-27T18:31:45.45+00:00","modifiedAt":"2026-10-06T18:17:46.581+00:00","affected":[{"ecosystem":"Vendor product","name":"GO Driver","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"MongoDB\",\n                    \"product\": \"GO Driver\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.1.0\",\n                            \"lessThan\": \"2.8.2\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.9.0\",\n                            \"lessThan\": \"2.9.2\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.1,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://jira.mongodb.org/browse/GODRIVER-4075","https://pkg.go.dev/go.mongodb.org/mongo-driver/v2@v2.8.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-81521","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-81521","identifiers":["CVE-2026-81521"]},"retained":false,"historicalAffected":[]}],"coverage":[]}