Buffer overflow in Hathach Tinyusb
CVE-2026-61495
TinyUSB through 0.21.0, fixed in commit e85c2b8, contains an out-of-bounds write vulnerability in the MTP device class helper mtp_container_get_string() in src/class/mtp/mtp.h that allows a malicious USB host to corrupt adjacent memory by supplying a crafted MTP string with an unbounded character count. Attackers can exploit the unchecked memcpy operation copying up to 510 bytes into a fixed-size destination buffer to achieve code execution or cause a denial of service on the TinyUSB MTP device.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/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/commit/e85c2b8affa1efbf00d398d59e7a87d3e61cc4a9 (issue-tracking, patch)
- www.vulncheck.com/advisories/tinyusb-out-of-bounds-write-via-mtp-container-get-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61495?
- CVE-2026-61495 is a medium-severity vulnerability in Hathach Tinyusb, classified under Out-of-bounds Write. CVSS score: 6.8/10. Published 2026-11-03.
- How severe is CVE-2026-61495?
- Medium severity. CVSS v3 base score is 6.8 out of 10.