What is CVE-2026-13351?

CVE-2026-13351 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2026-06-25.

How severe is CVE-2026-13351?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Zephyrproject Zephyr

CVE-2026-13351

Zephyr's IPv6 network stack can be prevented from receiving or processing future incoming packets by sending a small number of maliciously fragmented IPv6 packets. When such a packet is handled by the fragment-header processing path, the associated RX network packet buffer (allocated from a memory slab) is not released back to the pool. Repeating the malicious packet exhausts all RX buffer slots, after which the device can no longer obtain RX buffers and stops receiving traffic, resulting in a denial of service.

Published 2026-06-25 · last modified 2026-07-06.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf (Exploit, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-13351?: CVE-2026-13351 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2026-06-25.
How severe is CVE-2026-13351?: High severity. CVSS v3 base score is 7.5 out of 10.