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    CVE-2026-2703

    A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.

    Published:Feb 19, 2026
    Last Modified:Apr 17, 2026
    EPS:Feb 19, 2026
    EPSS Score:0.0001
    CVSS Score:3.3

    Affected Products

    Vendor
    Xlnt-community
    Product
    Xlnt

    Exploits

    https://github.com/oneafter/0128/blob/main/xl1/reprohttps://github.com/xlnt-community/xlnt/issues/137

    Common Weakness Enumeration

    CWE-193 Off-by-one Error

    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