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    CVE-2026-1678

    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.

    Published:Mar 5, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 5, 2026
    EPSS Score:0.00079
    CVSS Score:9.4

    Affected Products

    Vendor
    Zephyrproject
    Product
    Zephyr
    Vendor
    Zephyrproject-rtos
    Product
    Zephyr

    Exploits

    https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-536f-h63g-hj42

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High