CVE-2026-81523: Cross-tenant database retargeting via dot/NUL injection in namespace strings in libmongocrypt
A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to this issue?
Applications using MongoDB libmongocrypt automatic-encryption context setup are exposed when a caller can supply the database identifier used by that setup.
What access does an attacker need?
The published vector is local and requires low privileges. No user interaction is required.
What is the expected impact of successful exploitation?
The issue can cause incorrect schema selection through database-identifier manipulation. This may result in limited disclosure or modification of information handled by the application; availability impact is not indicated.