CVE-2026-6843
Publication date 22 April 2026
Last updated 6 June 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| nano | 26.04 LTS resolute |
Fixed 8.7.1-1ubuntu0.1
|
| 25.10 questing |
Fixed 8.4-1ubuntu0.1
|
|
| 24.04 LTS noble |
Fixed 7.2-2ubuntu0.2
|
|
| 22.04 LTS jammy |
Fixed 6.2-1ubuntu0.2
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.5 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-8386-1
- Nano vulnerabilities
- 4 June 2026