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    CVE-2025-6544

    A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.

    Published:Sep 21, 2025
    Last Modified:Oct 8, 2025
    EPS:Sep 21, 2025
    EPSS Score:0.00095
    CVSS Score:9.8

    Affected Products

    Vendor
    H2o
    Product
    H2o
    Vendor
    H2oai
    Product
    H2o-3

    Exploits

    https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40https://huntr.com/bounties/53f35a0f-d644-4f82-93aa-89fe7e0aed40

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

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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