---
id: CVE-2026-61497
title: TinyUSB < 0.20.1 Integer Underflow via HID Report Descriptor Parser
summary: >-
  TinyUSB before 0.20.1 contains an integer underflow vulnerability in the HID
  host report descriptor parser tuh_hid_parse_report_descriptor() in
  src/class/hid/hid_host.c that allows a malicious USB device to trigger an
  out-of-bounds read …
severity: medium
cvss: 5.2
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-191
vendor: hathach
product: TinyUSB
affected:
  - TinyUSB < 0.20.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-03T21:28:00.459663Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T21:28:16.965Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-61497'
references:
  - url: 'https://github.com/hathach/tinyusb/releases/tag/0.21.0'
    label: Fixed Release Tag
  - url: >-
      https://github.com/hathach/tinyusb/commit/85047e1777f5c20b7a936aa905c746125d3ed066
    label: Patch Commit
  - url: >-
      https://www.vulncheck.com/advisories/tinyusb-integer-underflow-via-hid-report-descriptor-parser
    label: >-
      VulnCheck Advisory: TinyUSB < 0.20.1 Integer Underflow via HID Report
      Descriptor Parser
tags:
  - cve.org
epss: 0.00276
epssPercentile: 0.20177
ingestedAt: '2026-11-05T20:33:06.527Z'
---

## Overview

TinyUSB before 0.20.1 contains an integer underflow vulnerability in the HID host report descriptor parser tuh_hid_parse_report_descriptor() in src/class/hid/hid_host.c that allows a malicious USB device to trigger an out-of-bounds read by subtracting an item size from the remaining descriptor length without validating the item fits within the remaining buffer. Attackers can present a crafted USB device with a truncated report descriptor causing the uint16_t desc_len value to underflow, resulting in out-of-bounds memory reads and denial of service on the host system.

## Affected

- `TinyUSB < 0.20.1`

## Remediation

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