Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

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

Medium 5.2

In plain English

A medium-severity security flaw in TinyUSB from hathach. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)5.2Medium

Exploit odds (30 days)0.3%top 79.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	tinyusb	no fix listed	DEBIAN-CVE-2026-61497
Debian:14	tinyusb	no fix listed	DEBIAN-CVE-2026-61497
Ubuntu:26.04:LTS	tinyusb	no fix listed	UBUNTU-CVE-2026-61497
Ubuntu:26.10	tinyusb	no fix listed	UBUNTU-CVE-2026-61497

Affected products (as reported)

Vendor	Product	Versions
hathach	TinyUSB	0 – before 0.20.1

Weakness: CWE-191 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References

Fixed Release Tag patch, release-notes
Patch Commit issue-tracking, patch
VulnCheck Advisory: TinyUSB < 0.20.1 Integer Underflow via HID Report Descriptor Parser third-party-advisory