mport permits repository and package mirror fetches over insecure transport

published 2026-09-17 52 d ago modified 2026-09-21 48 d ago also EUVD-2026-82324

cvss: 6.0; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits: 0; none known

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.

Patch / fix

links 3

github.com/MidnightBSD/mport@9b4d0f9 commit
github.com/MidnightBSD/mport#121 pull request
github.com/MidnightBSD/mport/releases/tag/2.7.8 release

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 48 d ago (2026-09-21)

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.0	CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
CNA	4.0	6.0	CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

MidnightBSD mport

Classification

Weakness

CWE-319 Cleartext Transmission of Sensitive Information
CWE-345 Insufficient Verification of Data Authenticity

References

Sources

CVE List CVE-2026-54586
NVD CVE-2026-54586

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary