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

  - Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6,     Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time     match the actual permissions granted to the app at runtime, in the case that there's a null byte in the     metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user.
    Flatpak shows permissions to the user during install by reading them from the xa.metadata key in the     commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. Flatpak     compares these permissions to the *actual* metadata, from the metadata file to ensure it wasn't lied to.
    However, the actual metadata contents are loaded in several places where they are read as simple C-style     strings. That means that, if the metadata file includes a null terminator, only the content of the file     from *before* the terminator gets compared to xa.metadata. Thus, any permissions that appear in the     metadata file after a null terminator are applied at runtime but not shown to the user. So maliciously     crafted apps can give themselves hidden permissions. Users who have Flatpaks installed from untrusted     sources are at risk in case the Flatpak has a maliciously crafted metadata file, either initially or in an     update. This issue is patched in versions 1.12.3 and 1.10.6. As a workaround, users can manually check the     permissions of installed apps by checking the metadata file or the xa.metadata key on the commit metadata.
    (CVE-2021-43860)

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

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Linux Distros Unpatched Vulnerability : CVE-2021-43860

high Nessus Plugin ID 256730

Version 1.2

Version 1.1

Version 1.2 Aug 12, 2026, 9:10 AM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:U/RL:U/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:U/RC:C") Detection (updated detection logic) Plugin Feed: 202608120910
Version 1.1 Aug 27, 2025, 5:32 PM New Plugin Feed: 202508271732