Buffer overflow in Zephyrproject Zephyr
CVE-2026-1681
Issuing an ICMP ping via the `net ping` shell command to a device's own IPv4 address causes the network stack to recursively re-enter the input path on the same system work-queue stack. Because the destination is recognized as a local address, both the echo request and the resulting echo reply are processed inline before the current frame returns. The nested input-path frames exceed the work-queue stack and trigger a stack overflow.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.001 (3.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6fcc-8rwr-w7xx (Exploit, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-1681?
- CVE-2026-1681 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Uncontrolled Recursion. CVSS score: 6.1/10. Published 2026-05-12.
- How severe is CVE-2026-1681?
- Medium severity. CVSS v3 base score is 6.1 out of 10.