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 no impact on confidentiality and integrity and 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.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.