EUVD-2026-82328Severity by source
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/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:X/V:X/RE:X/U:X
Local foothold and TOCTOU symlink race give AV:L/AC:H/PR:L; UI:N since the privileged install is admin-driven, not attacker-solicited; integrity-only high impact with minor availability, no confidentiality.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Symlink following and dot-dot path traversal in MidnightBSD mport prior to 2.7.8 lets a local attacker who can already write to part of the target installation tree redirect directory creation and ownership/permission changes to attacker-selected paths during a privileged package installation. The flaw sits in the ASSET_DIR and ASSET_DIR_OWNER_MODE handling in libmport/bundle_read_install_pkg.c, which performed path-based mport_mkdirp(), chown and chmod operations (CWE-59); impact is integrity-only, since an attacker can create directories or alter ownership and mode on paths outside the intended package directories with no confidentiality exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires (1) a local attacker who already has write access to part of the target installation tree on a MidnightBSD host running mport prior to 2.7.8, and (2) a privileged package install processing ASSET_DIR or ASSET_DIR_OWNER_MODE directory assets to occur while the attacker's symlink or dot-dot path is in place. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but sharply gated local integrity flaw, not a mass-exploitation priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade mport to 2.7.8, available from https://github.com/MidnightBSD/mport/releases/tag/2.7.8, which contains the file-descriptor-based directory asset handling introduced by commit a4fa996df1fbebeff3691e1b512c807b5f414b5d via PR https://github.com/MidnightBSD/mport/pull/119; consult the vendor advisory GHSA-f69w-h3gh-r86p for details. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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