Use of Externally-Controlled Format String Affecting nano package, versions [,9.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published27 Apr 2026
- disclosed13 Apr 2026
- creditMichał Majchrowicz, Marcin Wyczechowski
Introduced: 13 Apr 2026
CVE-2026-6843 (opens in a new tab)How to fix?
Upgrade nano to version 9.1 or higher.
Overview
Affected versions of this package are vulnerable to Use of Externally-Controlled Format String via the statusline function. An attacker can cause the application to crash by creating a directory with a name containing format string specifiers and triggering the display of an error message referencing this directory.