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CVE-2026-54576

mport package installation has symlink TOCTOU in chown and chmod handling

CVSS 4.0 5.8 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-54576

Published

mport is the MidnightBSD Package Manager. Prior to 2.7.8, do_actual_install() in libmport/bundle_read_install_pkg.c used path-based lstat(), chown(), stat(), and chmod() operations while installing package files. A local attacker with write access to a target directory could replace a checked file with a symlink before privileged ownership or mode changes were applied, redirecting those changes to an attacker-selected path and compromising filesystem integrity or permissions. This issue is fixed in version 2.7.8.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-54576

Published

mport

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "MidnightBSD",
                    "product": "mport",
                    "versions": [
                        {
                            "version": "< 2.7.8",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON