CVE-2026-54582 mport package installation can overwrite existing unmanaged or differently owned files
A crafted package can overwrite existing files during installation if force mode is enabled, compromising filesystem integrity and potentially allowing privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-54582?
CVE-2026-54582 is a medium-severity path traversal vulnerability in MidnightBSD mport, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, package installation lacked a preflight check for incoming non-directory assets that already existed on disk. The affected logic across libmport/check_preconditions.c, libmport/install_primative.c, and libmport/mport_private.h did not apply MPORT_PRECHECK_FILE_CONFLICTS, so a crafted or conflicting package could overwrite a file owned by another package or unmanaged by mport. The check is bypassed only when the operator explicitly enables mport->force. Privileged installation without that override could compromise local filesystem integrity and package database consistency. This issue is fixed in version 2.7.8.
Which versions are affected by CVE-2026-54582?
How do I fix CVE-2026-54582?
No fix has been published for CVE-2026-54582 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-54582 being exploited?
There is no known exploitation of CVE-2026-54582 in the wild and no public exploit code.
Sources
Also known as GHSA-5773-7r4r-rpgx.