CVE-2026-54576 Details
Description
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.
A time-of-check time-of-use (TOCTOU) race condition vulnerability has been identified in the MidnightBSD package manager, mport, versions prior to 2.7.8. The issue arises during the installation of package files, where the do_actual_install() function in libmport/bundle_read_install_pkg.c improperly handles file ownership and permissions. A local attacker with write access to the target directory could exploit this vulnerability by replacing a file with a symlink before the installation process applies the necessary privileges or mode changes. This could redirect those changes to an arbitrary path, potentially leading to unauthorized modifications of filesystem integrity or permissions.
Users can upgrade to MidnightBSD mport version 2.7.8 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 17, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/MidnightBSD/mport/commit/4676ac05b1056b54a3d38d03ae8a478bf12c9abe | [email protected] | Source CodeVendor |
| https://github.com/MidnightBSD/mport/pull/150 | [email protected] | Issue TrackingVendor |
| https://github.com/MidnightBSD/mport/releases/tag/2.7.8 | [email protected] | Release NotesVendor |
| https://github.com/MidnightBSD/mport/security/advisories/GHSA-23g3-7fv3-3ccf | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [email protected] |
| CWE-59 | Improper Link Resolution Before File Access ('Link Following') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| MidnightBSD mport | < 2.7.8 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 17, 2026 | New CVE Received | [email protected] |