UBUNTU-CVE-2026-121550

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UBUNTU-CVE-2026-121550

Summary:

Details: nnn through 5.3 contains an insecure file handling vulnerability that allows local attackers to redirect writes because main() accepts an existing NNN_FIFO path without verifying it is a FIFO. Attackers can pre-create the documented predictable /tmp/nnn.fifo path as a symlink or readable regular file, causing victim-writable files to be overwritten or leaking the victim's browsed paths.

References: https://ubuntu.com/security/CVE-2026-121550, https://www.cve.org/CVERecord?id=CVE-2026-121550, https://github.com/jarun/nnn, https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L10635, https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L7433, https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff, https://github.com/jarun/nnn/issues/2188, https://www.vulncheck.com/advisories/nnn-through-5.3-symlink-following-write-via-nnn-fifo-handling