CVE-2026-121550

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    CVE-2026-121550

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: nnn through 5.3 Symlink-Following Write via NNN_FIFO Handling

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121550.json, https://nvd.nist.gov/vuln/detail/CVE-2026-121550, https://www.vulncheck.com/advisories/nnn-through-5.3-symlink-following-write-via-nnn-fifo-handling, https://github.com/jarun/nnn/issues/2188, https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff, https://github.com/jarun/nnn, https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L10635, https://github.com/jarun/nnn/blob/v5.3/src/nnn.c#L7433

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -04715921aece0257fef7a8558c0783493d98efff

    Affected versions

    v5.3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-121550 | CVE-DB