CVE-2026-121550
nnn through 5.3 Symlink-Following Write via NNN_FIFO Handling
CVSS Score
3.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-59 |
| Vendor | jarun |
| Product | nnn |
| Published | Nov 3, 2026 |
Stay Ahead of the Next One
Get instant alerts for jarun nnn
Be the first to know when new low vulnerabilities affecting jarun nnn are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
jarun / nnn
0 ≤ 5.3
References
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/src/nnn.c#L10635 github.com: https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L7433 vulncheck.com: https://www.vulncheck.com/advisories/nnn-through-5.3-symlink-following-write-via-nnn-fifo-handling
Credits
George Chen