Buffer overflow in Zephyrproject-rtos Zephyr
CVE-2026-1678
dns_unpack_name() caches the buffer tailroom once and reuses it while appending DNS labels. As the buffer grows, the cached size becomes incorrect, and the final null terminator can be written past the buffer. With assertions disabled (def…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (24.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H.
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-1678?
- CVE-2026-1678 is a critical-severity vulnerability in Zephyrproject-rtos Zephyr, classified under Out-of-bounds Write. CVSS score: 9.4/10. Published 2026-03-05.
- How severe is CVE-2026-1678?
- Critical severity. CVSS v3 base score is 9.4 out of 10.