CVE-2026-81522

Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Driver

Published Aug 27, 2026 CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Description
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.

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
First Time appeared Mongodb c\+\+ Driver
CPEs cpe:2.3:a:mongodb:c\+\+_driver:*:*:*:*:*:mongodb:*:*
Vendors & Products Mongodb c\+\+ Driver
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb c\# Driver
Vendors & Products Mongodb
Mongodb c\# Driver
Type Values Removed Values Added
Description 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.
Title Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C++ Driver
Weaknesses CWE-116
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mongodb
Published
Updated
Aug 29, 2026, 3:55 AM
Reserved
Aug 26, 2026, 10:13 PM
Status
Analyzed
Published
Aug 27, 2026, 8:18 PM
Modified
Sep 29, 2026, 7:17 PM