CVE-2026-54585Network attack vector

Filesystem writes via unconfined absolute sample paths

Published Sep 17, 2026 · Updated Sep 17, 2026

Path traversal in MidnightBSD Mport before 2.7.8 allows attackers to write outside the install root via crafted package manifests. The create_sample_file() function in libmport/bundle_read_install_pkg.c uses absolute sample source and destination paths without prefixing mport->root. Exploitation requires privileged installation of an attacker-influenced package with an alternate installation root, allowing writes to the host filesystem outside that root.

CVSS severity6.0
Medium
EPSS probability0.54%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in MidnightBSD Mport before 2.7.8 allows attackers to write outside the install root via crafted package manifests. The create_sample_file() function in libmport/bundle_read_install_pkg.c uses absolute sample source and destination paths without prefixing mport->root. Exploitation requires privileged installation of an attacker-influenced package with an alternate installation root, allowing writes to the host filesystem outside that root.

The record

CVE
CVE-2026-54585
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
MidnightBSD
Product
Mport
Classifications
CWE-73, CWE-22, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.7.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MidnightBSD · Mportversion=< 2.7.8

Published CVSS scores

6.0GitHub CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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