CVE-2026-62785 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/11/2026
A heap-based buffer overflow vulnerability exists within the Windows Lightweight Directory Access Protocol implementation that enables remote code execution by unauthenticated attackers. This critical security flaw resides in the way the LDAP service processes incoming network requests, specifically when handling malformed or oversized data structures within the heap memory allocation. The vulnerability stems from insufficient input validation and bounds checking mechanisms within the LDAP parsing routines, allowing an attacker to overflow allocated heap buffers and potentially overwrite adjacent memory regions.
The technical exploitation of this vulnerability follows a well-defined pattern that aligns with common attack methodologies documented in the ATT&CK framework under technique T1203 for legitimate credentials and T1059 for command execution. When an LDAP client sends specially crafted malicious data to a vulnerable Windows system, the service fails to properly validate the size of incoming buffers before copying data into heap-allocated memory regions. This oversight creates a condition where attacker-controlled data can overwrite critical heap metadata or function pointers, enabling arbitrary code execution with the privileges of the compromised LDAP service account.
The operational impact of this vulnerability extends beyond simple remote code execution as it provides attackers with persistent access to domain environments through the LDAP protocol. Windows systems running vulnerable LDAP implementations become potential entry points for lateral movement within Active Directory networks, allowing threat actors to escalate privileges and maintain persistence across the enterprise infrastructure. The vulnerability affects multiple Windows versions including server editions and workstations where LDAP services are enabled, making it particularly dangerous in enterprise environments where directory services form the backbone of authentication and authorization systems.
Security professionals should implement immediate mitigations including applying Microsoft security patches released through regular update cycles and network segmentation to limit exposure of LDAP ports to trusted networks only. The vulnerability demonstrates characteristics consistent with CWE-121 heap-based buffer overflow conditions where insufficient bounds checking leads to memory corruption. Organizations must also consider implementing network monitoring solutions that can detect anomalous LDAP traffic patterns and establish strict access controls for LDAP services while maintaining detailed audit logs of all directory service interactions to facilitate incident response activities.