by Kastro CVE-2026-1678
zephyrproject-rtos Zephyr — dns: memory‑safety issue in the DNS name parser
Description · from the CVE record
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 (default), a malicious DNS response can trigger an out-of-bounds write when CONFIG_DNS_RESOLVER is enabled.
Affected
ProductAffectedFixed inSource
Zephyr< 3.7.23.7.2CNA
Zephyr4.0.0 – < 4.2.24.2.2CNA
Zephyr4.3.0 – < 4.3.14.3.1CNA
Scores by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
zephyr (CNA)9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total