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

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-914d7851ae advisory.

    Automatic update for libxls-1.6.3-9.fc45.

    ##### **Changelog**

    ```
    * Sat Aug 15 2026 Elliott Sales de Andrade <quantum.analyst@gmail.com> - 1.6.3-9
    - Backport CVE patches
    - fixes CVE-2026-26824 (rhbz#2484566)
    - fixes CVE-2026-26825 (rhbz#2484567)

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 46 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-dabb47ed4a advisory.

    Automatic update for libxls-1.6.3-9.fc46.

    ##### **Changelog**

    ```
    * Sat Aug 15 2026 Elliott Sales de Andrade <quantum.analyst@gmail.com> - 1.6.3-9
    - Backport CVE patches
    - fixes CVE-2026-26824 (rhbz#2484566)
    - fixes CVE-2026-26825 (rhbz#2484567)

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 (CVE-2026-26824)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
335892	Fedora 45 : libxls (2026-914d7851ae)	Nessus	Fedora Local Security Checks	Local	medium
335891	Fedora 46 : libxls (2026-dabb47ed4a)	Nessus	Fedora Local Security Checks	Local	medium
318858	Linux Distros Unpatched Vulnerability : CVE-2026-26824	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-26824

medium

Tenable Plugins

medium

medium

medium