# CVE-2026-81522: mongo-cxx-driver: A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters em...

CVE-2026-81522 is fixed in mongo-cxx-driver on 1 platform by DEBIAN-CVE-2026-81522 (version 4.5.1-1), released September 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-81522
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 27, 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mongo-cxx-driver Debian 14 | 4.5.1-1 | [DEBIAN-CVE-2026-81522](https://patchblox.com/security/data/fix/linux/debian-cve-2026-81522.md) | Sep 3, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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