CVE-2026-9753: MongoDB

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff containing a malformed binary diff to return memory out-of-bounds or crash the server. $_internalApplyOplogUpdate can be executed by any authenticated user with access to the aggregate command.

Affected products

• MongoDB MongoDB: before 7.0.35 (fixed in 7.0.35); from 8.0.0, before 8.0.24 (fixed in 8.0.24); from 8.2.0, before 8.2.10 (fixed in 8.2.10); from 8.3.0, before 8.3.3 (fixed in 8.3.3)

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