Apr 2026: Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-26156 Published on April 14, 2026
Windows Hyper-V Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code locally.
Weakness Types
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-26156
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Affected Versions
Microsoft Windows 10 Version 1607:- Version 10.0.14393.0 and below 10.0.14393.9060 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8644 is affected.
- Version 10.0.19044.0 and below 10.0.19044.7184 is affected.
- Version 10.0.19045.0 and below 10.0.19045.7184 is affected.
- Version 10.0.22631.0 and below 10.0.22631.6936 is affected.
- Version 10.0.22631.0 and below 10.0.22631.6936 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32690 is affected.
- Version 10.0.26200.0 and below 10.0.26200.8246 is affected.
- Version 10.0.28000.0 and below 10.0.28000.1836 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9060 is affected.
- Version 10.0.14393.0 and below 10.0.14393.9060 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8644 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8644 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5020 is affected.
- Version 10.0.25398.0 and below 10.0.25398.2274 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32690 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32690 is affected.