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Weakness (CWE)

CWE-62: UNIX Hard Link

Variant Incomplete

The product, when opening a file or directory, does not sufficiently account for when the name is associated with a hard link to a target that is outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

How to prevent it (1 mitigation)

  1. Architecture and Design

    Follow the principle of least privilege when assigning access rights to entities in a software system.

    Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Source: MITRE CWE-62

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  • High 7.7
    CVE-2026-109518 Public exploit

    APT RCE via hard link reuse

    On Debian, Ubuntu, and derivative Linux distributions, an on-path attacker who can manipulate the HTTP traffic (including a malicious mirror or proxy) between an APT client and an archive server triggered by a package install can trick the client into install…

    Ubuntu Debian APT APT Debian Ubuntu Alpine