CVE-2026-54585 mport sample file handling can write outside the configured root
A malicious package manifest can write files outside the installation root, compromising local filesystem integrity in MidnightBSD's mport.
- 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-2026-54585?
CVE-2026-54585 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, create_sample_file() in libmport/bundle_read_install_pkg.c did not constrain absolute source and destination paths from the sample-file manifest directive to mport->root. A malicious or malformed package manifest could therefore direct privileged sample-file handling to copy or write outside the configured installation root, compromising local filesystem integrity. This issue is fixed in version 2.7.8.
Weakness: CWE-22
Which versions are affected by CVE-2026-54585?
How do I fix CVE-2026-54585?
No fix has been published for CVE-2026-54585 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-2026-54585 being exploited?
There is no known exploitation of CVE-2026-54585 in the wild and no public exploit code.
Sources
Also known as GHSA-xqjc-rxmm-p27v.