CVE-2026-121549

medium

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.

References

https://www.vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-overwrite-via-pdfread-and-nuke-plugins

https://github.com/jarun/nnn/issues/2188

https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff

https://github.com/jarun/nnn/blob/v5.3/plugins/pdfread#L9-L10

https://github.com/jarun/nnn/blob/v5.3/plugins/nuke#L280

https://github.com/jarun/nnn

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-115894

Details

Source: Mitre, NVD

Published: 2026-11-03

Updated: 2026-11-03

Risk Information

CVSS v2

Base Score: 3.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:C/A:N

Severity: Low

CVSS v3

Base Score: 4.4

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N

Severity: Medium

CVSS v4

Base Score: 4.1

Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00109