MidnightBSD mport up to 2.7.7 Bundle Read Install bundle_read_install_pkg.c mport_mkdirp path traversal

Summaryinfo

A vulnerability, which was classified as very critical, has been found in MidnightBSD mport up to 2.7.7. Affected is the function mport_mkdirp of the file libmport/bundle_read_install_pkg.c of the component Bundle Read Install. This manipulation causes path traversal. This vulnerability appears as CVE-2026-54587. The attack requires local access. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in MidnightBSD mport up to 2.7.7. Affected by this vulnerability is the function mport_mkdirp of the file libmport/bundle_read_install_pkg.c of the component Bundle Read Install. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

mport is the MidnightBSD Package Manager. Prior to 2.7.8, directory assets handled as ASSET_DIR or ASSET_DIR_OWNER_MODE in libmport/bundle_read_install_pkg.c used path-based mport_mkdirp(), ownership, and permission operations. A local attacker able to modify part of the target installation tree could use dot-dot traversal or substitute symlinks during privileged package installation, causing directory creation or attribute changes to affect attacker-selected paths outside the intended package directories. This issue is fixed in version 2.7.8.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-54587 since 06/15/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.7.8 eliminates this vulnerability.

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Productinfo

Vendor

• MidnightBSD

Name

• mport

Version

• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7

Website

• Product: https://github.com/MidnightBSD/mport/

CPE 2.3info

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CPE 2.2info

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