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    CVE-2026-89028

    MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.

    Published:Sep 16, 2026
    Last Modified:Oct 1, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00582
    CVSS Score:7.5

    Affected Products

    Vendor
    Mikrotik
    Product
    Routeros

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    CVE-2026-84411 (CVSS 9.3) — The web management service in affected RouterOS versions contains an integer underflow in its HTTP request bod…
    CVE-2026-93345 (CVSS 8.7) — MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLR…
    CVE-2026-56719 (CVSS 6.3) — MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that al…
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    CVE-2026-89020 (CVSS 5.3) — MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnera…
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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