CVE
CVE-2026-1678
dns: memory‑safety issue in the DNS name parser
dnsunpackname() 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 CONFIGDNSRESOLVER is enabled.
Package Versions Affected
Package Version
patch Availability
No items found.
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Fix Without Upgrading
Detect compatible fix
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CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.4
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
C
H
U
-
Related Resources
No items found.
References
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1678.json, https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42, https://nvd.nist.gov/vuln/detail/CVE-2026-1678, https://github.com/zephyrproject-rtos/zephyr