CVE-2026-9753 Server crash via malformed binary diff passed to $_internalApplyOplogUpdate.

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...

CVE-2026-9753

The vulnerability CVE-2026-9753 affects MongoDB’s aggregation pipeline via the internal stage $_internalApplyOplogUpdate. The issue allows an attacker with authenticated access to the aggregate command to pass a document diff containing a malformed binary diff, which can cause memory out-of-bound...