Vulnerability · Published Aug 27, 2026 · Assigned by mongodb
CVE-2026-81526Cross-database write redirection via unvalidated dotted database name in bulk write namespaces
Medium 6.5
In plain English
A medium-severity injection in Rust Driver from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Official description
The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logical boundary enforced by the application.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | Rust Driver | 3.0.0 – before 3.8.2 |
Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N