CVE-2026-54586

What it is

mport is the MidnightBSD Package Manager. Prior to 2.7.8, the mport_fetch_index(), mport_fetch_bootstrap_index(), and mport_fetch_bundle() paths in libmport/fetch.c accepted non-HTTPS repository and package mirror URLs without a url_is_https() enforcement check. When a cleartext URL was configured or returned by mirror data, a network-positioned attacker could tamper with package index or package download traffic and compromise package selection or integrity. This issue is fixed in version 2.7.8.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of data tampering.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-17 17:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-21 21:17 UTC Last updatedMost recent change to the record

Details

Published

2026-09-17 17:16 UTC

Last modified

2026-09-21 21:17 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-319 · Cleartext transmission

Record status

Deferred

Attack profile CVSS 4.0 · 6.0

Attack vector

Adjacent network

Complexity

Low

Attack requirements

Present

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

High

Availability

Low