CVE-2026-81521 — Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver
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 nam…
Published: 2026-08-27 · CVSS: 7.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7