MongoDB $_internalApplyOplogUpdate OOBB via malformed oplog diff
CVE-2026-9753 Published on June 9, 2026
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.
Vulnerability Analysis
CVE-2026-9753 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Type
Improper Validation of Specified Type of Input
The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
Products Associated with CVE-2026-9753
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Affected Versions
MongoDB Server:- Version 8.3.0 and below 8.3.3 is affected.
- Version 8.2.0 and below 8.2.10 is affected.
- Version 8.0.0 and below 8.0.24 is affected.
- Version 7.0.0 and below 7.0.35 is affected.