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Vulnerability record · CVE-2026-54583 · published 17 September 2026

CVE-2026-54583: Path traversal vulnerability

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.

8.3 CVSS 4.0 High EPSS 0.54% · top 56.8% CWE-22 · Path traversalCWE-73 · CWE-73 Deferred
8.3CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-54583), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.