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    CVE-2026-26824

    libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file

    Published:Jun 3, 2026
    Last Modified:Jun 5, 2026
    EPS:Jun 3, 2026
    EPSS Score:0.00018
    CVSS Score:6.5

    Affected Products

    Vendor
    Libxls
    Product
    Libxls
    Vendor
    Libxls Project
    Product
    Libxls

    Exploits

    https://github.com/libxls/libxls/issues/155https://github.com/libxls/libxls/issues/155

    Common Weakness Enumeration

    CWE-457 Use of Uninitialized Variable

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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