What is CVE-2026-13066?

CVE-2026-13066 is a medium-severity vulnerability in MongoDB, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 6.5/10. Published 2026-07-22.

How severe is CVE-2026-13066?

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

Vulnerability in MongoDB

CVE-2026-13066

Improper handling of DBPointer objects during BSON serialization in MongoDB's server-side JavaScript engine can result in internal process memory contents being included in data returned to the client. This constitutes an unintended information disclosure affecting deployments that use server-side JavaScript.

EPSS: 0.004 (30.0th percentile) — read the EPSS interpretation.

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:H/I:N/A:N.

Affected products

Mongodb
Mongodb Server — versions 7.0, 8.0, 8.2.0

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

cna@mongodb.com (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-13066?: CVE-2026-13066 is a medium-severity vulnerability in MongoDB, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 6.5/10. Published 2026-07-22.
How severe is CVE-2026-13066?: Medium severity. CVSS v3 base score is 6.5 out of 10.