CVE-2026-1678
CRITICAL
INFO
Priority: 0.04
BB Relevance:
80/100
Published: 2026-03-05
Modified: 2026-11-05
First seen: 2026-11-05
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
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.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| zephyrproject | zephyr | < 3.7.2 |
References & Advisories (1)
Exploit
Patch
Vendor Advisory