What’s Vulnerable › Vulnerabilities

CVE-2026-54583: mport package bundle downloads allow unsafe destination filenames

• Severity: high (CVSS 8.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-09-17
• Weakness: CWE-22

Description

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.

Affected products

• MidnightBSD mport: before 2.7.8

References

• https://github.com/MidnightBSD/mport/commit/cad959d47bc79a62b6a7163800fbfe35633e7cf8
• https://github.com/MidnightBSD/mport/pull/125
• https://github.com/MidnightBSD/mport/releases/tag/2.7.8
• https://github.com/MidnightBSD/mport/security/advisories/GHSA-mr62-mqwj-vhh3

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