Aggregation sub-pipeline null dereference may allow DoS via crafted getMore
CVE-2026-9743 is fixed in MongoDB on 1 platform by MongoDB 8.2.3 (version 8.2.3), released December 16, 2025. It is not reported as exploited. Patch Radar priority: High.
In MongoDB Server 8.0, an aggregation stage can leave its _subPipeline field null during processing of certain pipelines. If a getMore is subsequently issued on the same cursor, the server may dereference this null sub-pipeline when reattaching to the operation context, accessing an invalid address and crashing the process. This issue allows an authenticated user who can run aggregation pipelines to cause a denial of service by issuing a specially crafted aggregation followed by getMore on affected versions.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| MongoDB | 8.2.3 | MongoDB 8.2.3 | Dec 16, 2025 |
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