CVE-2026-81521
Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-99 |
| Vendor | mongodb |
| Product | go driver |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 27, 2026 |
| Last Updated | Aug 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
MongoDB / GO Driver
2.1.0 < 2.8.2