What is CVE-2026-1679?

CVE-2026-1679 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.3/10. Published 2026-03-28.

How severe is CVE-2026-1679?

High severity. CVSS v3 base score is 7.3 out of 10.

Buffer overflow in Zephyrproject Zephyr

CVE-2026-1679

The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow `eswifi->buf`, corrupting kernel memory (CWE-120). Exploit requires local code that can call the socket send API; no remote attacker can reach it directly.

Vulnerability class: Buffer Overflow

Published 2026-03-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qx3g-5g22-fq5w (Exploit, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-1679?: CVE-2026-1679 is a high-severity vulnerability in Zephyrproject Zephyr, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.3/10. Published 2026-03-28.
How severe is CVE-2026-1679?: High severity. CVSS v3 base score is 7.3 out of 10.