---
id: CVE-2026-116776
title: >-
  USB Test: Heap-based Buffer Overflow in getSectorSize via untrusted
  DISK_GEOMETRY.BytesPerSector leads to RCE/DoS
summary: >-
  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.BytesPerSect…
severity: high
cvss: 7
cvssVector: 'CVSS:4.0/AV:P/AC:L/AT:N/PR:H/UI:P/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: n-romanovich
product: usb-test
affected:
  - usb-test < 1.1.5
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-29T18:36:46.958376Z'
exploitAvailable: true
published: '2026-10-28'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T18:37:18.070Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116776'
references:
  - url: >-
      https://github.com/n-romanovich/usb-test/security/advisories/GHSA-cfrv-c9q2-7cr3
    label: >-
      https://github.com/n-romanovich/usb-test/security/advisories/GHSA-cfrv-c9q2-7cr3
  - url: >-
      https://github.com/n-romanovich/usb-test/commit/5b6caac844461024520b02337d3a541fbe128f89
    label: >-
      https://github.com/n-romanovich/usb-test/commit/5b6caac844461024520b02337d3a541fbe128f89
  - url: 'https://github.com/n-romanovich/usb-test/releases/tag/release-v1.1.5'
    label: 'https://github.com/n-romanovich/usb-test/releases/tag/release-v1.1.5'
tags:
  - cve.org
  - exploit-available
epss: 0.00177
epssPercentile: 0.07342
ingestedAt: '2026-10-28T16:13:50.582Z'
---

## Overview

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.

## Affected

- `usb-test < 1.1.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.