CVE-2026-121549

MEDIUM 4.4

nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins

CVSS Score

4.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-377
Vendor	jarun
Product	nnn
Published	Nov 3, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

jarun / nnn

0 ≤ 5.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/jarun/nnn/issues/2188 github.com: https://github.com/jarun/nnn github.com: https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff github.com: https://github.com/jarun/nnn/blob/v5.3/plugins/pdfread#L9-L10 github.com: https://github.com/jarun/nnn/blob/v5.3/plugins/nuke#L280 vulncheck.com: https://www.vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-overwrite-via-pdfread-and-nuke-plugins

Credits

George Chen