What is CVE-2026-10639?

CVE-2026-10639 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 4.8/10. Published 2026-06-16.

How severe is CVE-2026-10639?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Use After Free in Zephyrproject Zephyr

CVE-2026-10639

In Zephyr's native IPv4 stack, icmpv4_handle_echo_request() in subsys/net/ip/icmpv4.c builds an echo-reply packet (reply), hands it to net_try_send_data(), and then, on success, calls net_stats_update_icmp_sent(net_pkt_iface(reply)). net_t…

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Zephyrproject Zephyr — versions 1.14.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-10639?: CVE-2026-10639 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Use After Free. CVSS score: 4.8/10. Published 2026-06-16.
How severe is CVE-2026-10639?: Medium severity. CVSS v3 base score is 4.8 out of 10.