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.
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Fixes

Solution

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Workaround

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History

Sat, 29 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 28 Aug 2026 07:45:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb go Driver
Vendors & Products Mongodb
Mongodb go Driver

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver
Weaknesses CWE-99
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 7.1, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-08-28T15:52:13.039Z

Reserved: 2026-08-26T22:13:12.343Z

Link: CVE-2026-81521

cve-icon Vulnrichment

Updated: 2026-08-28T15:52:07.908Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-27T20:18:50.350

Modified: 2026-08-28T21:16:15.740

Link: CVE-2026-81521

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T08:45:17Z

Weaknesses