CVE-2026-116776

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CVE-2026-116776

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

Details: 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.

References: https://github.com/n-romanovich/usb-test/releases/tag/release-v1.1.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116776.json, https://github.com/n-romanovich/usb-test/security/advisories/GHSA-cfrv-c9q2-7cr3, https://nvd.nist.gov/vuln/detail/CVE-2026-116776, https://github.com/n-romanovich/usb-test/commit/5b6caac844461024520b02337d3a541fbe128f89