What is CVE-2026-8718?

CVE-2026-8718 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 8.4/10. Published 2026-08-10.

How severe is CVE-2026-8718?

High severity. CVSS v3 base score is 8.4 out of 10.

Buffer overflow in Zephyrproject Zephyr

CVE-2026-8718

tls_opt_dtls_peer_connection_id_value_get() in subsys/net/lib/sockets/sockets_tls.c, which handles getsockopt(SOL_TLS, TLS_DTLS_PEER_CID_VALUE), passed the caller-supplied optval directly to mbedtls_ssl_get_peer_cid() without verifying the…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H.

Affected products

Zephyrproject Zephyr — versions 3.5.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-8718?: CVE-2026-8718 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Out-of-bounds Write. CVSS score: 8.4/10. Published 2026-08-10.
How severe is CVE-2026-8718?: High severity. CVSS v3 base score is 8.4 out of 10.