CVE-2026-121549

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    CVE-2026-121549

    Published: 3 Nov 2026Last Modified: 8 Nov 2026

    Summary: nnn through 5.3 Insecure Temporary File Symlink Overwrite via pdfread and nuke Plugins

    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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121549.json, https://nvd.nist.gov/vuln/detail/CVE-2026-121549, https://www.vulncheck.com/advisories/nnn-through-5.3-insecure-temporary-file-symlink-overwrite-via-pdfread-and-nuke-plugins, 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/plugins/nuke#L280, https://github.com/jarun/nnn/blob/v5.3/plugins/pdfread#L9-L10

    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-2026-121549 | CVE-DB