CVE-2026-50682 in Windows
Summary
by MITRE • 07/14/2026
Out-of-bounds read in Windows Active Directory allows an authorized attacker to deny service over a network.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical out-of-bounds read flaw within the Windows Active Directory service that can be exploited by authenticated attackers to initiate denial of service attacks across networked environments. The technical implementation involves improper validation of input data structures during Active Directory operations, specifically when processing directory service requests that contain malformed or excessively large data elements. Such flaws typically arise from insufficient bounds checking mechanisms in memory management routines where the application fails to verify that array indices or buffer access operations remain within valid memory boundaries.
The operational impact of this vulnerability extends beyond simple service disruption as it can be leveraged to create sustained denial of service conditions that compromise directory services critical to enterprise network operations. Active Directory serves as the cornerstone for authentication, authorization, and directory services in most corporate environments, making this vulnerability particularly dangerous when exploited by malicious actors who understand how to craft specific requests that trigger the out-of-bounds read condition. Attackers can exploit this weakness through network-based attacks without requiring physical access to systems, potentially affecting domain controllers and other critical Active Directory infrastructure components.
The vulnerability aligns with CWE-129, which specifically addresses improper validation of array indices and buffer bounds checking in software implementations. From an adversary perspective, this flaw maps to several ATT&CK techniques including privilege escalation through service manipulation and denial of service via resource exhaustion. The attack surface encompasses various Active Directory protocols such as LDAP, Kerberos, and NTLM authentication mechanisms that may be susceptible to malformed requests designed to trigger the vulnerable code paths.
Mitigation strategies should include immediate deployment of Microsoft security patches addressing the specific Active Directory vulnerability while implementing network-based monitoring solutions to detect anomalous directory service requests. Organizations must also establish robust input validation policies for directory services and consider implementing rate limiting controls on authentication and directory query operations. Network segmentation and access control measures can help limit the potential impact of exploitation attempts, while regular vulnerability assessments should focus on identifying similar bounds checking issues in other directory service implementations and enterprise applications that may be subject to analogous flaws.