CVE-2026-121549

Name	CVE-2026-121549
Description	nnn through 5.3 contains an insecure temporary file vulnerability in the pdfread and nuke plugins that allows local attackers to overwrite files by exploiting predictable paths in /tmp. Attackers can pre-create a symlink at the name-derived or PID-derived path so the victim's plugin truncates and overwrites any file the victim can write.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nnn (PTS)	bookworm	4.7-1	vulnerable
	trixie	5.0-1	vulnerable
	forky, sid	5.3-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nnn	source	(unstable)	(unfixed)	unimportant

https://github.com/jarun/nnn/issues/2188
https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff
Neutralised by kernel hardening