UBUNTU-CVE-2026-121549

    Dashboard / Vulnerabilities / UBUNTU-CVE-2026-121549

    UBUNTU-CVE-2026-121549

    Published: 3 Nov 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-121549

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2026-121549, https://www.cve.org/CVERecord?id=CVE-2026-121549, https://github.com/jarun/nnn, https://github.com/jarun/nnn/blob/v5.3/plugins/nuke#L280, https://github.com/jarun/nnn/blob/v5.3/plugins/pdfread#L9-L10, https://github.com/jarun/nnn/commit/04715921aece0257fef7a8558c0783493d98efff, https://github.com/jarun/nnn/issues/2188, https://www.vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-overwrite-via-pdfread-and-nuke-plugins

    Affected packages

    Package

    Name: nnn

    Purl: pkg:deb/ubuntu/nnn?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.3-2

    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
    UBUNTU-CVE-2026-121549 | CVE-DB