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TI-2026-39417 Aliases CVE-2026-54582

mport package installation can overwrite existing unmanaged or differently owned files

Priority LOW 28CWE-668Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

mport is the MidnightBSD Package Manager. Prior to 2.7.8, package installation lacked a preflight check for incoming non-directory assets that already existed on disk. The affected logic across libmport/check_preconditions.c, libmport/install_primative.c, and libmport/mport_private.h did not apply MPORT_PRECHECK_FILE_CONFLICTS, so a crafted or conflicting package could overwrite a file owned by another package or unmanaged by mport. The check is bypassed only when the operator explicitly enables mport->force. Privileged installation without that override could compromise local filesystem integrity and package database consistency. This issue is fixed in version 2.7.8.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00554 46th percentileScored 2026-11-07
Fix Fixed mport (MidnightBSD): 2.7.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MidnightBSDmportbefore 2.7.82.7.8Patch availableCNA
  • mport VendorMidnightBSD Affected before 2.7.8 Fixed in 2.7.8 Patch available CNA

Remediation

  • Fix · CNA mport (MidnightBSD) Fixed in 2.7.8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54582

References

Other 4

  • TI-2008-04392 The TCP implementation in (1) Linux, (2) platforms based on BSD Unix, (3) Microsoft… CVSS 2.0HIGH 7.1
  • TI-2009-00656 The pf_test_rule function in OpenBSD Packet Filter (PF), as used in OpenBSD 4.2 through… CVSS 2.0HIGH 7.8
  • TI-2026-39418 mport package bundle downloads allow unsafe destination filenames CVSS 4.0HIGH 8.3
  • TI-2026-39415 mport index decompression can leave partial or corrupt index data after zstd failures CVSS 4.0HIGH 8.3
  • TI-2026-39416 mport bootstrap index fetch can continue after hash verification failure CVSS 4.0HIGH 8.3
  • TI-2026-39421 mport permits repository and package mirror fetches over insecure transport CVSS 4.0MEDIUM 6.0
See all 17 →

Sources

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