CVE-2026-13058 in Server
Summary
by MITRE • 07/22/2026
An authenticated user with basic write privileges can cause the mongod process to terminate abnormally by sending a crafted transaction command with an incomplete set of required fields. The issue stems from inconsistent validation across related transaction command parameters, resulting in a fatal internal invariant failure and denial of service.
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Analysis
by VulDB Data Team • 07/22/2026
This vulnerability represents a critical denial of service condition within the mongodb database system that can be exploited by authenticated users possessing basic write privileges. The flaw manifests when a malicious user crafts a transaction command containing incomplete required fields, triggering an abnormal termination of the mongod process. The root cause lies in inconsistent validation mechanisms across transaction command parameters, creating a scenario where the internal invariant checking system fails catastrophically rather than gracefully handling the malformed input.
The technical implementation of this vulnerability exploits the transaction processing subsystem within mongodb's database engine, specifically targeting the validation logic that governs transaction command execution. When a transaction command is submitted with missing or improperly structured required fields, the system's inconsistent validation approach causes an internal invariant failure that cannot be recovered from, forcing the mongod process to terminate abruptly. This represents a fundamental flaw in the error handling architecture where invalid input should result in proper error codes and graceful rejection rather than system-wide termination.
From an operational impact perspective, this vulnerability creates a significant risk for mongodb deployments as it allows relatively low-privileged authenticated users to disrupt database services. The denial of service condition affects all database operations since the mongod process must restart to resume normal functionality, potentially causing extended downtime for applications dependent on the database. The vulnerability is particularly concerning in production environments where database availability is critical and where user access controls may not adequately restrict write privileges.
The vulnerability aligns with CWE-248, an issue category that encompasses "Uncaught Exception" conditions where programs fail to properly handle exceptional circumstances. Additionally, this flaw maps to ATT&CK technique T1499.004 which covers "Endpoint Denial of Service: OS File and Data Destruction," though in this case the destruction is more accurately characterized as process termination rather than data destruction. The inconsistent validation approach also reflects poor input sanitization practices that could potentially be leveraged for further exploitation if combined with other vulnerabilities.
Mitigation strategies should focus on implementing comprehensive input validation at multiple layers within the transaction processing pipeline to ensure consistent handling of malformed commands. Database administrators should consider upgrading to patched versions of mongodb where this validation inconsistency has been addressed and implement proper monitoring for abnormal process termination events. Access control measures should be reviewed to minimize the number of users with write privileges that could potentially exploit this condition, while also implementing application-level validation to catch malformed transaction commands before they reach the database engine.