CVE-2026-81521

Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver

Published Aug 27, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:mongodb:go_driver:*:*:*:*:*:mongodb:*:*
Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
mongodb
Published
Updated
Oct 6, 2026, 6:17 PM
Reserved
Aug 26, 2026, 10:13 PM
Status
Analyzed
Published
Aug 27, 2026, 8:18 PM
Modified
Oct 6, 2026, 7:18 PM
Severity
Important
Public date
Aug 27, 2026, 6:31 PM