Medium · published July 23, 2026
An authenticated user with read-only privileges can cause the mongod process to terminate abnormally by issuing a crafted aggregation command, resulting in denial of service for all connected clients until the process is restarted. The issue stems from an internal engine selection inconsistency triggered by a specific combination of aggregation options.
| Product | Versions | Fixed in |
|---|---|---|
| mongodb/mongodb | ≥ 8.0.0, < 8.0.28 | 8.0.28 |