{"id":"CVE-2026-121549","title":"nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins","summary":"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-deri…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N","cvssSource":"cna","cwe":["CWE-377"],"vendor":"jarun","product":"nnn","affected":["nnn <= 5.3"],"published":"2026-11-03","updated":"2026-11-03","sourceUpdated":"2026-11-03T15:17:08.749Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121549","references":[{"url":"https://github.com/jarun/nnn/issues/2188","label":"GitHub Issue #2188"},{"url":"https://github.com/jarun/nnn"},{"url":"https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff","label":"Fix commit"},{"url":"https://github.com/jarun/nnn/blob/v5.3/plugins/pdfread#L9-L10"},{"url":"https://github.com/jarun/nnn/blob/v5.3/plugins/nuke#L280"},{"url":"https://www.vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-overwrite-via-pdfread-and-nuke-plugins","label":"VulnCheck Advisory: nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins"}],"tags":["cve.org"],"epss":0.00109,"epssPercentile":0.01245,"ingestedAt":"2026-11-05T19:30:42.975Z","slug":"CVE-2026-121549","body":"## Overview\n\nnnn 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.\n\n## Affected\n\n- `nnn <= 5.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}