What is CVE-2026-10655?

CVE-2026-10655 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 6.5/10. Published 2026-06-30.

How severe is CVE-2026-10655?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Use After Free in Zephyrproject Zephyr

CVE-2026-10655

The asynchronous SNTP client in Zephyr (subsys/net/lib/sntp/sntp.c, sntp_close_async) closed the UDP socket file descriptor directly from the calling thread immediately after detaching it from the network socket service, without synchroniz…

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

Affected products

Zephyrproject Zephyr — versions 4.2.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-10655?: CVE-2026-10655 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 6.5/10. Published 2026-06-30.
How severe is CVE-2026-10655?: Medium severity. CVSS v3 base score is 6.5 out of 10.