CVE-2026-81522

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-08-27 20:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-29 19:17 UTC Last updatedMost recent change to the record

Details

Published

2026-08-27 20:18 UTC

Last modified

2026-09-29 19:17 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-116

Record status

Analyzed

Affected

• Mongodb c\+\+ Driver < 4.5.2

Attack profile CVSS 4.0 · 8.6

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

None