{"id":"CVE-2026-121550","published":"2026-11-03T16:17:26.897","lastModified":"2026-11-03T16:30:17.150","description":"nnn through 5.3 contains an insecure file handling vulnerability that allows local attackers to redirect writes because main() accepts an existing NNN_FIFO path without verifying it is a FIFO. Attackers can pre-create the documented predictable /tmp/nnn.fifo path as a symlink or readable regular file, causing victim-writable files to be overwritten or leaking the victim's browsed paths.","cvssScore":3.3,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N","cwes":["CWE-59"],"vendors":[],"products":[],"references":[{"url":"https://github.com/jarun/nnn","tags":[]},{"url":"https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L10635","tags":[]},{"url":"https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L7433","tags":[]},{"url":"https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff","tags":[]},{"url":"https://github.com/jarun/nnn/issues/2188","tags":[]},{"url":"https://www.vulncheck.com/advisories/nnn-through-5.3-symlink-following-write-via-nnn-fifo-handling","tags":[]}],"exploitRefs":[{"url":"https://github.com/jarun/nnn","tags":[]},{"url":"https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L10635","tags":[]},{"url":"https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L7433","tags":[]},{"url":"https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff","tags":[]},{"url":"https://github.com/jarun/nnn/issues/2188","tags":[]}],"hasPoc":true,"ai":null}