CVE-2026-116776 USB Test: Heap-based Buffer Overflow in getSectorSize via untrusted DISK_GEOMETRY.BytesPerSector leads to RCE/DoS

High 7.0 Published 28 Oct 2026 Updated 29 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-116776?

CVE-2026-116776 is a high-severity vulnerability in n-romanovich usb-test, published on 28 Oct 2026.

Official description

USB Test is a lightweight Windows CLI utility for verifying sector integrity and detecting overreported capacity on USB flash drives. Prior to version 1.1.5, getSectorSize() in USB Test/src/driveinfo.cpp trusts DISK_GEOMETRY.BytesPerSector returned by IOCTL_DISK_GET_DRIVE_GEOMETRY without checking whether the call succeeded or enforcing size bounds. USB Test/src/drivetest.cpp uses the value for division and to size a heap buffer before memcpy(buffer.data(), &sector, 8), so a physically connected malicious USB storage device can report a value below eight bytes and cause repeated out-of-bounds writes, or report zero and cause a divide-by-zero denial of service when a user starts a drive test. The heap corruption can crash the elevated application and may permit arbitrary code execution. This issue is fixed in version 1.1.5.

Weakness: CWE-122

Which versions are affected by CVE-2026-116776?

How do I fix CVE-2026-116776?

No fix has been published for CVE-2026-116776 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-116776 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-116776 exists.

Sources

Also known as GHSA-cfrv-c9q2-7cr3.