Integer overflow in MongoDB
CVE-2026-13063
An authenticated user with standard read/write privileges can cause the mongod process to terminate due to an out-of-memory condition by sending a crafted aggregation command. MongoDB's libmongocrypt library insufficiently validates payload-supplied values, which can result in an excessively large memory allocation.
Vulnerability class: Integer Overflow
EPSS: 0.002 (13.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Mongodb
- Mongodb Server — versions 8.2.0, 8.3.0
Weakness classification (CWE)
References
- cna@mongodb.com (Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-13063?
- CVE-2026-13063 is a medium-severity vulnerability in MongoDB, classified under Integer Overflow or Wraparound. CVSS score: 4.3/10. Published 2026-07-22.
- How severe is CVE-2026-13063?
- Medium severity. CVSS v3 base score is 4.3 out of 10.