CVE-2026-69562 in SQL Server
Summary
by MITRE • 09/09/2026
Out-of-bounds read in SQL Server allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described constitutes a critical security flaw within Microsoft SQL Server, specifically categorized as an out-of-bounds read error. This type of memory corruption issue arises when the software reads data from a memory location that is outside the intended buffer boundary. In the context of database management systems like SQL Server, such errors often occur during the processing of complex queries or specific protocol interactions where input validation mechanisms fail to adequately check array indices or pointer offsets before accessing memory resources. The root cause typically lies in insufficient verification of user-supplied data lengths against allocated buffer sizes, allowing an attacker to craft a maliciously formatted request that triggers the database engine to access unauthorized memory regions.
From a technical perspective, this flaw aligns with Common Weakness Enumeration (CWE) category CWE-125, which defines out-of-bounds read vulnerabilities. When SQL Server processes a specially crafted network packet or query containing malformed data structures, it may attempt to retrieve information from adjacent memory blocks that were not intended for public disclosure. Because the vulnerability is triggered over a network connection, it does not require local access or authentication in many scenarios, making it particularly dangerous. An unauthorized attacker can exploit this condition by sending specific requests designed to cause the server to leak contents of its own memory space back through the response stream. This mechanism bypasses standard security controls because the error manifests as a data disclosure rather than a system crash, allowing for stealthy exploitation without immediate detection by intrusion prevention systems that focus on denial-of-service indicators.
The operational impact of this vulnerability is primarily centered around information disclosure and potential privilege escalation pathways. By successfully exploiting the out-of-bounds read, an attacker can extract sensitive internal state information from the SQL Server process memory. This leaked data may include authentication tokens, encryption keys, session identifiers, or other confidential database contents that are not meant to be exposed externally. Such exposure compromises the confidentiality integrity of the entire database environment and can serve as a stepping stone for further attacks. For instance, disclosed credentials could allow lateral movement within an organization's network, while leaked cryptographic material might enable decryption of stored sensitive data. This aligns with MITRE ATT&CK techniques related to Credential Access and Data Exfiltration, specifically those involving memory scraping or protocol manipulation to steal secrets from running processes.
Mitigation strategies for this vulnerability require immediate attention to patch management and configuration hardening. Organizations must apply the latest security updates provided by Microsoft that address the specific buffer validation logic within SQL Server components responsible for handling network requests. Until patches are applied, administrators should restrict network access to SQL Server instances using firewalls or virtual private networks to limit exposure to trusted sources only. Additionally, enabling strict input validation at application layers and minimizing the attack surface by disabling unnecessary services can reduce the likelihood of successful exploitation. Regular vulnerability scanning and monitoring for anomalous memory usage patterns in database servers are also recommended practices to detect potential attempts to leverage this flaw before significant data loss occurs.