DNS
CVE-2026-1678
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Buffer overflow in Zephyr RTOS dns_unpack_name() function causing OOB writes. PoC available.
Technical ContextAI
CWE-787 in DNS label unpacking. Cached tailroom becomes incorrect as buffer grows.
RemediationAI
Update Zephyr.
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Same weakness CWE-787 – Out-of-bounds Write
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External POC / Exploit Code
Leaving vuln.today