CVE-2026-50468 in SQL Server
Summary
by MITRE • 07/14/2026
Buffer over-read in SQL Server allows an authorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical buffer over-read condition within Microsoft SQL Server that enables authenticated attackers to extract sensitive information from system memory through network-based communications. The flaw occurs when the database engine processes certain SQL queries or data operations that trigger improper memory handling, leading to unintended data disclosure. According to common weakness enumeration standards, this vulnerability maps to CWE-125: "Out-of-bounds Read" which specifically addresses scenarios where applications read data beyond allocated buffer boundaries. The security implications extend beyond simple information disclosure as this weakness creates potential pathways for further exploitation and reconnaissance activities.
The technical implementation of this vulnerability involves SQL Server's internal memory management mechanisms failing to properly validate input boundaries during query processing or data serialization operations. When an authenticated user submits carefully crafted SQL statements or data payloads, the system's buffer handling routines may access memory locations beyond their intended boundaries, inadvertently exposing portions of system memory containing sensitive data such as database credentials, connection strings, or other confidential information. This type of vulnerability operates at the application layer and requires authentication to exploit, making it particularly dangerous in environments where privileged accounts exist.
From an operational impact perspective, this vulnerability creates significant risks for organizations relying on SQL Server deployments, especially those with insufficient network segmentation or weak access controls. The disclosed information could include database connection details, user credentials, or internal system configurations that adversaries could leverage for privilege escalation or lateral movement within the network infrastructure. Security frameworks such as the mitre att&ck matrix categorize this under initial access and credential access techniques where attackers can use information disclosure to gather intelligence before proceeding with more sophisticated attacks. The vulnerability's network-based nature means it can be exploited remotely without requiring physical system access, amplifying its potential impact.
Organizations should implement immediate mitigations including applying Microsoft security patches and updates, implementing network segmentation to limit SQL Server exposure, and enforcing strict access controls on database accounts. Database administrators should conduct thorough audit reviews of user permissions and monitor for unusual query patterns that might indicate exploitation attempts. Additional protective measures include configuring firewalls to restrict SQL Server communication to trusted networks only, implementing database activity monitoring solutions, and establishing regular vulnerability assessment procedures. The remediation process should also involve validating that all connected applications properly sanitize input data and implement proper memory boundary checking mechanisms to prevent similar issues in custom database applications.