Integer overflow in Hathach Tinyusb
CVE-2026-61497
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.2 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/hathach/tinyusb/releases/tag/0.21.0 (release-notes, patch)
- github.com/hathach/tinyusb/commit/85047e1777f5c20b7a936aa905c746125d3ed066 (issue-tracking, patch)
- www.vulncheck.com/advisories/tinyusb-integer-underflow-via-hid-report-descripto… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61497?
- CVE-2026-61497 is a medium-severity vulnerability in Hathach Tinyusb, classified under Integer Underflow. CVSS score: 5.2/10. Published 2026-11-03.
- How severe is CVE-2026-61497?
- Medium severity. CVSS v3 base score is 5.2 out of 10.