What is CVE-2026-10666?

CVE-2026-10666 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 8.1/10. Published 2026-07-12.

How severe is CVE-2026-10666?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Zephyrproject Zephyr

CVE-2026-10666

parse_ipv4() in subsys/net/ip/utils.c (reached via net_ipaddr_parse() for strings of the form "a.b.c.d:port") copies the port substring into a fixed 17-byte stack buffer (char ipaddr[NET_IPV4_ADDR_LEN + 1]) using a length of str_len - end…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zephyrproject Zephyr — versions 1.9.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-10666?: CVE-2026-10666 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 8.1/10. Published 2026-07-12.
How severe is CVE-2026-10666?: High severity. CVSS v3 base score is 8.1 out of 10.