Improper Validation of Specified Type of Input in MongoDB Server - CVE-2026-9753
Published: August 18, 2026
Vulnerability identifier: #VU144171
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-9753
CWE-ID: CWE-1287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information and cause a denial of service.
The vulnerability exists due to improper validation of specified type of input in the $_internalApplyOplogUpdate aggregation pipeline stage when processing a document diff containing a malformed binary diff. A remote user can execute the stage with a crafted document diff to disclose sensitive information and cause a denial of service.
The stage can be executed by a user with access to the aggregate command.
Affected software
MongoDB Server
How to mitigate CVE-2026-9753
Install security update from vendor's website.
MongoDB Server - addressed in versions 7.0.35, 8.0.24, 8.2.10, 8.3.3