CVE-2026-82066: MongoDB

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A heap out-of-bounds read security issue exists in the query planning component of MongoDB Server. An authenticated user with database read and write privileges can trigger the security issue through crafted query operations, causing the server to read memory beyond allocated buffer boundaries. The revealed memory contents may be partially observable through diagnostic query statistics output.

Affected products

• MongoDB MongoDB: from 7.0.0, before 7.0.41 (fixed in 7.0.41); from 8.0.0, before 8.0.30 (fixed in 8.0.30); from 8.3.0, before 8.3.9 (fixed in 8.3.9)

Published 2026-09-08. Last modified 2026-09-16.