# CVE-2026-81522

## Summary

- **CVE ID:** CVE-2026-81522
- **Severity:** HIGH
- **CVSS Score:** 8.6 (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)
- **CWE:** CWE-116
- **Published:** Aug 27, 2026
- **Last Modified:** Aug 29, 2026

## 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.

## Affected Products

- MongoDB — C++ Driver (3.0.0)

## References

- [CNA](https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1)
- [CNA](https://jira.mongodb.org/browse/CXX-3552)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 18.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._