MidnightBSD mport up to 2.7.7 fetch libmport/fetch.c is_valid_bundle_filename bundlefile path traversal

Summaryinfo

A vulnerability classified as very critical has been found in MidnightBSD mport up to 2.7.7. This affects the function is_valid_bundle_filename of the file libmport/fetch.c of the component fetch. This manipulation of the argument bundlefile causes path traversal. This vulnerability appears as CVE-2026-54583. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in MidnightBSD mport up to 2.7.7. It has been declared as very critical. Affected by this vulnerability is the function is_valid_bundle_filename of the file libmport/fetch.c of the component fetch. The manipulation of the argument bundlefile 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, libmport/fetch.c did not consistently reject empty, dot, dot-dot, or slash-containing bundle filenames before composing package download and write paths. Malicious package index data could place an unsafe value in indexEntry->bundlefile, and the missing is_valid_bundle_filename() checks allowed downloaded package data to be written outside the intended cache location or to an unsafe destination name. This issue is fixed in version 2.7.8.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-54583 since 06/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

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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