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    CVE-2026-3663

    A vulnerability was found in xlnt-community xlnt up to 1.6.1. This issue affects the function xlnt::detail::compound_document_istreambuf::xsgetn of the file source/detail/cryptography/compound_document.cpp of the component XLSX File Parser. Performing a manipulation results in out-of-bounds read. The attack is only possible with local access. The exploit has been made public and could be used. The patch is named 147. It is recommended to apply a patch to fix this issue.

    Published:Mar 7, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 7, 2026
    EPSS Score:0.00023
    CVSS Score:3.3

    Affected Products

    Vendor
    Xlnt-community
    Product
    Xlnt

    Exploits

    https://github.com/oneafter/0128/blob/main/xl3/reprohttps://github.com/xlnt-community/xlnt/issues/139

    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