Vulnerability details

CVE-2026-61495

hathach TinyUSB

TinyUSB 0.21.0 Out-of-Bounds Write via mtp_container_get_string()

CVSS 4.0

7.0High

Official description

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.

CVSS scores

Score	Version	Source	Vector
7.0High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
6.8Medium	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
hathach	TinyUSB	v ≤ 0.21.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/hathach/tinyusb/commit/e85c2b8affa1efbf00d398d59e7a87d3e61cc4a9 issue-trackingpatch
https://www.vulncheck.com/advisories/tinyusb-out-of-bounds-write-via-mtp-container-get-string third-party-advisory

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Details

Published: 2026-11-03
Last updated: 2026-11-04
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.26%

Probability of exploitation in 30 days

18.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-787
Out-of-bounds Write