CVE-2026-81522
Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Driver
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application.
| CWE | CWE-116 |
| Vendor | mongodb |
| Product | c++ 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:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
MongoDB / C++ Driver
3.0.0 < 4.5.1