Integer overflow in MongoDB
CVE-2026-18687
MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.002 (12.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- MongoDB — versions 9.0.0, 9.1.0
- MongoDB Server — versions 8.3.0, 8.0
Weakness classification (CWE)
References
- jira.mongodb.org/browse/SERVER-130628 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-18687?
- CVE-2026-18687 is a high-severity vulnerability in MongoDB, classified under Integer Underflow. CVSS score: 7.1/10. Published 2026-08-11.
- How severe is CVE-2026-18687?
- High severity. CVSS v3 base score is 7.1 out of 10.