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MongoDB MongoDB ServerExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators

Risk 56
Severity
8.8
EPSS
0.05%
Use After Free
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

A use-after-free vulnerability can be triggered in sharded clusters by an authenticated user with the read role who issues a specially crafted $lookup or $graphLookup aggregation pipeline.

First published (updated )
CVE-2026-4148

MongoDB MongoDB ServerStack memory disclosure in filemd5 command

Risk 29
Severity
7.1
EPSS
0.03%
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

An authenticated user with the read role may read limited amounts of uninitialized stack memory via specially-crafted issuances of the filemd5 command.

First published (updated )
CVE-2026-4147

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