What is CVE-2026-12052?

CVE-2026-12052 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 5.2/10. Published 2026-08-11.

How severe is CVE-2026-12052?

Medium severity. CVSS v3 base score is 5.2 out of 10.

Buffer overflow in Zephyrproject Zephyr

CVE-2026-12052

The USB device-side CDC NCM class control-to-host handler usbd_cdc_ncm_cth in subsys/usb/device_next/class/usbd_cdc_ncm.c builds a fixed-size response for the GET_NTB_PARAMETERS (28-byte struct ntb_parameters) and GET_NTB_INPUT_SIZE (8-byt…

Vulnerability class: Buffer Overflow

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:N/I:L/A:H.

Affected products

Zephyrproject Zephyr — versions 4.0.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

vulnerabilities@zephyrproject.org (patch)
vulnerabilities@zephyrproject.org

Frequently asked questions

What is CVE-2026-12052?: CVE-2026-12052 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 5.2/10. Published 2026-08-11.
How severe is CVE-2026-12052?: Medium severity. CVSS v3 base score is 5.2 out of 10.