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    CVE-2026-86247

    Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.

    Published:Sep 23, 2026
    Last Modified:Oct 6, 2026
    EPS:Sep 23, 2026
    EPSS Score:0.00179
    CVSS Score:7.4

    Affected Products

    Vendor
    Apache
    Product
    Apache Tomcat
    Vendor
    Apache
    Product
    Tomcat Native

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-366 Race Condition within a Thread

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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