CVE-2026-9743: MongoDB

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• MongoDB MongoDB: from 8.0.0, before 8.0.24 (fixed in 8.0.24)

Published 2026-06-09. Last modified 2026-07-23.