CVE-2026-1678
Last modified
CVE-2026-1678 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zephyrproject | Zephyr | <= 4.3.0 |
References
- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42Exploit, Patch, Vendor Advisory
- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42Exploit, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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