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CVE-2026-61497— TinyUSB < 0.20.1 Integer Underflow via HID Report Descriptor Parser

Quick assessment

Affected
hathach TinyUSB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TinyUSB 0.20.1 之前的版本在 文件中的 HID 主机报告描述符解析函数 中存在整数下溢漏洞。该漏洞允许恶意 USB 设备通过从剩余描述符长度中减去项大小（而未验证该项是否适配剩余缓冲区）来触发越界读取攻击。攻击者可构造一个被截断的报告描述符的 USB 设备，导致 变量发生下溢，进而引发主机系统的越界内存读取，最终造成拒绝服务（DoS）。

CVSS 5.2 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-61497

Vulnerability Information
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Vulnerability Title
TinyUSB < 0.20.1 Integer Underflow via HID Report Descriptor Parser
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hathach TinyUSB 0 ~ 0.20.1 -

II. Public POCs for CVE-2026-61497

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III. Intelligence Information for CVE-2026-61497

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Other References for CVE-2026-61497 (3)

IV. Related Vulnerabilities

Same product: TinyUSB
Same vendor: hathach
Same weakness: CWE-191