CVE-2026-1678
dns: memory‑safety issue in the DNS name parser
CVSS Score
9.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | zephyrproject-rtos |
| Product | zephyr |
| Published | Mar 5, 2026 |
| Last Updated | Mar 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High
Affected Versions
zephyrproject-rtos / Zephyr
* ≤ 4.3