CVE-2026-1678— dns: memory‑safety issue in the DNS name parser
Quick assessment
Affected
zephyrproject-rtos Zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Zephyr是Zephyr开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 4.3.0版本及之前版本存在安全漏洞，该漏洞源于dns_unpack_name函数缓存缓冲区尾空间不当，可能导致启用CONFIG_DNS_RESOLVER时发生越界写入。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-1678
Vulnerability Information
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Vulnerability Title
dns: memory‑safety issue in the DNS name parser
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 4.3.0版本及之前版本存在安全漏洞，该漏洞源于dns_unpack_name函数缓存缓冲区尾空间不当，可能导致启用CONFIG_DNS_RESOLVER时发生越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| zephyrproject-rtos | Zephyr | * ~ 4.3 | - |
|
II. Public POCs for CVE-2026-1678
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-1678 (1)
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V. Comments for CVE-2026-1678
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