What is CVE-2026-81526?

CVE-2026-81526 is a medium-severity vulnerability in MongoDB Rust Driver, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.5/10. Published 2026-08-27.

How severe is CVE-2026-81526?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in MongoDB Rust Driver

CVE-2026-81526

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.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Mongodb Rust Driver

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

Frequently asked questions

What is CVE-2026-81526?: CVE-2026-81526 is a medium-severity vulnerability in MongoDB Rust Driver, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.5/10. Published 2026-08-27.
How severe is CVE-2026-81526?: Medium severity. CVSS v3 base score is 6.5 out of 10.