Ubuntu alert USN-8386-1 (nano)

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[USN-8386-1] Nano vulnerabilities
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Thu, 04 Jun 2026 23:18:19 +0000
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==========================================================================
Ubuntu Security Notice USN-8386-1
June 04, 2026

nano vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Nano.

Software Description:
- nano: GNU nano editor

Details:

Michał 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)

Michał 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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  nano                            8.7.1-1ubuntu0.1
  nano-tiny                       8.7.1-1ubuntu0.1

Ubuntu 25.10
  nano                            8.4-1ubuntu0.1
  nano-tiny                       8.4-1ubuntu0.1

Ubuntu 24.04 LTS
  nano                            7.2-2ubuntu0.2
  nano-tiny                       7.2-2ubuntu0.2

Ubuntu 22.04 LTS
  nano                            6.2-1ubuntu0.2
  nano-tiny                       6.2-1ubuntu0.2

Ubuntu 20.04 LTS
  nano                            4.8-1ubuntu1.1+esm1
                                  Available with Ubuntu Pro
  nano-tiny                       4.8-1ubuntu1.1+esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  nano                            2.9.3-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  nano-tiny                       2.9.3-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8386-1
  CVE-2026-6842, CVE-2026-6843

Package Information:
  https://launchpad.net/ubuntu/+source/nano/8.7.1-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/nano/8.4-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/nano/7.2-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/nano/6.2-1ubuntu0.2


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