CVE-2026-81522

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.

Score

CVSS 4.0 8.6 High

Status

Analyzed - cna@mongodb.com

Published

2026-08-27

Last modified

2026-08-29

Weaknesses

CWE-116

Affected products

• C++ Driver (Mongodb)
• C Driver (Mongodb)

References

• https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1
• https://jira.mongodb.org/browse/CXX-3552