Is CVE-2026-121549 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121549?

CVE-2026-121549 has a CVSS v3 severity of MEDIUM (4.4).

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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.