CVEvulnerability

CVE-2026-1678

9.8 CRITICAL Published 2026-03-05 Modified 2026-10-15 Official page ↗
Status
Analyzed
Published
2026-03-05
Last modified
2026-10-15
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.4 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-787

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.

Affected configurations

• zephyrproject zephyr (<= 4.3.0)

Related

Weakness · CWE (1)

  • CWE-787 Out-of-bounds Write weakness

References