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    CVE-2026-67278

    MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. Because its trust store includes an e=3 root CA, an attacker controlling or redirecting an outbound RouterOS TLS connection can use the root’s public certificate - without its private key - to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)

    Published:Sep 5, 2026
    Last Modified:Sep 8, 2026
    EPS:Sep 5, 2026
    EPSS Score:0.00155
    CVSS Score:6.3

    Affected Products

    Vendor
    Mikrotik
    Product
    Routeros

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-86060 (CVSS 9.2) — RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohib…
    CVE-2026-67281 (CVSS 8.7) — RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocat…
    CVE-2026-67279 (CVSS 6.9) — RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was…
    CVE-2026-67277 (CVSS 8.8) — RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentic…
    CVE-2026-67276 (CVSS 9.2) — RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an author…
    CVE-2026-14227 (CVSS 6.9) — An API session‑management flaw in products with the MikroTik RouterOS API enabled are vulnerable to a Insuffic…
    CVE-2026-16347 (CVSS 8.7) — MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards again…
    CVE-2026-39042 (CVSS 7.5) — An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allow…
    CVE-2024-27686 (CVSS 7.5) — Mikrotik RouterOS (x86) 6.40.5 through 6.49.10 (fixed in 7) allows a remote attacker to cause a denial of serv…
    CVE-2025-42611 (CVSS 6.5) — RouterOS provides various services that rely on correct verification of client and server certificates to secu…

    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