CVE-2026-54584 mport trusts environment-controlled temporary directories in privileged metadata extraction
An attacker controlling the environment can redirect privileged package metadata extraction to a malicious location, potentially leading to privilege escalation or code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54584?
CVE-2026-54584 is a medium-severity path traversal vulnerability in MidnightBSD mport, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
mport is the MidnightBSD Package Manager. mport before 2.7.8 used TMPDIR while extracting package metafiles, including when running as root or in setuid/setgid contexts. An attacker able to control the environment for a privileged mport invocation could redirect temporary metadata extraction to an attacker-controlled location. PR 123 ignores unsafe TMPDIR values in privileged contexts and rejects empty TMPDIR. This issue has been patched in version 2.7.8.
Which versions are affected by CVE-2026-54584?
How do I fix CVE-2026-54584?
No fix has been published for CVE-2026-54584 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-2026-54584 being exploited?
There is no known exploitation of CVE-2026-54584 in the wild and no public exploit code.
Sources
Also known as GHSA-4vv3-3h8r-q6mq.