CVE-2026-1678

CVSS Score & Metrics

Base Score

9.4 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H                                    

Vulnerability Description

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.

Vulnerability Details

Published Date

March 05, 2026

Last Modified

March 09, 2026

CWE ID

CWE-787

Source

NVD

Vendor

zephyrproject

Product

zephyr

External References

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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