CVE-2026-62699 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an unauthorized attacker to execute code with a physical attack.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/11/2026
A heap-based buffer overflow vulnerability exists within the Windows Universal Disk Format File System Driver component that enables arbitrary code execution when exploited through a physical attack vector. This flaw resides in the UDFS driver implementation where insufficient input validation occurs during processing of malformed disk format structures, creating opportunities for attackers to manipulate heap memory allocation patterns. The vulnerability specifically manifests when the system processes specially crafted UDF filesystem metadata that exceeds expected buffer boundaries during parsing operations.
The technical mechanism behind this exploit involves memory corruption through improper bounds checking in heap allocation routines where attacker-controlled data is copied into insufficiently sized buffers. This condition creates a classic heap overflow scenario where adjacent memory regions become overwritten, potentially allowing an attacker to manipulate function pointers, return addresses, or other critical control structures within the driver's memory space. The vulnerability requires physical access to the target system since it operates at the filesystem driver level and cannot be triggered through network-based attacks alone.
This exploit presents significant operational impact as it enables privilege escalation from user-level access to kernel-level execution privileges, potentially allowing attackers to bypass standard security controls including user access control mechanisms and application whitelisting policies. The physical attack requirement does not diminish the severity since compromised physical devices often provide persistent access to sensitive networks and data environments. Organizations with systems running vulnerable UDFS drivers face elevated risk when devices are lost, stolen, or accessed by unauthorized personnel in unsecured locations.
The vulnerability aligns with CWE-121 heap-based buffer overflow classification and maps to ATT&CK technique T1059.007 for command and scripting interpreter execution. Mitigation strategies should include immediate deployment of Microsoft security updates addressing the UDFS driver vulnerability, implementation of physical security controls such as device encryption and secure boot configurations, and network segmentation to limit lateral movement capabilities. Additionally organizations should conduct comprehensive vulnerability assessments targeting all systems with UDF filesystem support and establish monitoring procedures for anomalous driver behavior or memory corruption indicators that may signal exploitation attempts.