Vulnerability Details CVE-2026-81521
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.6%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-81521
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cpe:2.3:a:mongodb:go_driver:2.1.0
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cpe:2.3:a:mongodb:go_driver:2.2.0
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cpe:2.3:a:mongodb:go_driver:2.2.1
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cpe:2.3:a:mongodb:go_driver:2.2.2
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cpe:2.3:a:mongodb:go_driver:2.2.3
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cpe:2.3:a:mongodb:go_driver:2.3.0
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cpe:2.3:a:mongodb:go_driver:2.3.1
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cpe:2.3:a:mongodb:go_driver:2.4.0
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cpe:2.3:a:mongodb:go_driver:2.4.1
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cpe:2.3:a:mongodb:go_driver:2.4.2
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cpe:2.3:a:mongodb:go_driver:2.4.3
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cpe:2.3:a:mongodb:go_driver:2.4.4
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cpe:2.3:a:mongodb:go_driver:2.5.0
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cpe:2.3:a:mongodb:go_driver:2.5.1
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cpe:2.3:a:mongodb:go_driver:2.6.0
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cpe:2.3:a:mongodb:go_driver:2.6.1
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cpe:2.3:a:mongodb:go_driver:2.6.2
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cpe:2.3:a:mongodb:go_driver:2.7.0
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cpe:2.3:a:mongodb:go_driver:2.8.0
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cpe:2.3:a:mongodb:go_driver:2.8.1