A flaw was found in nano. A local user could exploit a format string vulnerability in the `statusline()` function. By creating a directory with a name containing `printf` specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the `nano` application.

An update of the nano package has been released.

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8386-1 advisory.

    Micha Majchrowicz and Marcin Wyczechowski discovered that Nano created the ~/.local directory with     incorrect permissions. In environments with permissive umask settings, a local attacker could possibly use     this issue to inject a malicious launcher file, resulting in information disclosure or other unintended     actions. (CVE-2026-6842)

    Micha Majchrowicz and Marcin Wyczechowski discovered that Nano incorrectly handled directory names when     updating the status line. A local attacker could possibly use this issue to cause Nano to crash, resulting     in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and     Ubuntu 26.04 LTS. (CVE-2026-6843)

Tenable has extracted the preceding description block directly from the Ubuntu 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 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-fbeaecb457 advisory.

    * fix CVE-2026-6842 and CVE-29026-6843

    Resolves: CVE-2026-6842     Resolves: CVE-2026-6843     Resolves: rhbz#2455127     Resolves: rhbz#2455314


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 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-d0a0f1c3d2 advisory.

    * fix CVE-2026-6842 and CVE-29026-6843

    Resolves: CVE-2026-6842     Resolves: CVE-2026-6843     Resolves: rhbz#2455127     Resolves: rhbz#2455314


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 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3111ffa11a advisory.

    * fix CVE-2026-6842 and CVE-29026-6843

    Resolves: CVE-2026-6842     Resolves: CVE-2026-6843     Resolves: rhbz#2455127     Resolves: rhbz#2455314


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.

  - A flaw was found in nano. A local user could exploit a format string vulnerability in the `statusline()`     function. By creating a directory with a name containing `printf` specifiers, the application attempts to     display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for     the `nano` application. (CVE-2026-6843)

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

ID	Name	Product	Family	Severity
321791	Photon OS 5.0: Nano PHSA-2026-5.0-0886	Nessus	PhotonOS Local Security Checks	medium
318839	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Nano vulnerabilities (USN-8386-1)	Nessus	Ubuntu Local Security Checks	low
314524	Fedora 42 : nano (2026-fbeaecb457)	Nessus	Fedora Local Security Checks	low
313026	Fedora 43 : nano (2026-d0a0f1c3d2)	Nessus	Fedora Local Security Checks	low
312244	Fedora 44 : nano (2026-3111ffa11a)	Nessus	Fedora Local Security Checks	low
309201	Linux Distros Unpatched Vulnerability : CVE-2026-6843	Nessus	Misc.	medium

Detections

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CVE-2026-6843

medium

Tenable Plugins

medium

low

low

low

low

medium