CVE-2026-18692
8.8MongoDB · MongoDB Server
A use after free vulnerability in the timeseries bucket lifecycle management of MongoDB Server allows authenticated users with write access to potentially corrupt memory and execute arbitrary code.
Executive summary
A high severity use after free vulnerability in MongoDB Server could allow an authenticated user with write privileges to trigger memory corruption, posing a significant risk to system stability and data integrity.
Vulnerability
This vulnerability is a use after free condition (CWE-416) occurring within the timeseries bucket lifecycle management. It requires the attacker to be authenticated with write privileges to trigger the flaw.
Business impact
Successful exploitation of this memory corruption vulnerability can lead to unauthorized code execution or service crashes. Given the CVSS score of 8.8, this represents a high risk to database environments, potentially leading to total system compromise or prolonged operational downtime.
Remediation
Immediate Action: Upgrade all instances of MongoDB Server to version 8.3.8 or later to resolve the memory management defect.
Proactive Monitoring: Review database access logs for unusual write activity or unexpected service restarts that may indicate attempted exploitation.
Compensating Controls: Implement strict role based access control (RBAC) to limit write privileges to only necessary accounts, reducing the attack surface for this vulnerability.
Exploitation status
Public Exploit Available: Unknown
Analyst recommendation
The high severity of this vulnerability necessitates prompt action. Organizations should prioritize updating their MongoDB Server deployments to the patched version, 8.3.8, to prevent potential memory-based attacks that could lead to full system compromise.