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    CVE-2026-2967

    A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This affects the function getpeer of the file /src/net_builtin.c of the component TCP Sequence Number Handler. The manipulation leads to improper verification of source of a communication channel. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is reported as difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

    Published:Feb 23, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 23, 2026
    EPSS Score:0.00223
    CVSS Score:3.7

    Affected Products

    Vendor
    Cesanta
    Product
    Mongoose

    Exploits

    https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.mdhttps://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#poc

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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