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TI-2026-39418 Aliases CVE-2026-54583

mport package bundle downloads allow unsafe destination filenames

Priority LOW 37CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
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, libmport/fetch.c did not consistently reject empty, dot, dot-dot, or slash-containing bundle filenames before composing package download and write paths. Malicious package index data could place an unsafe value in indexEntry->bundlefile, and the missing is_valid_bundle_filename() checks allowed downloaded package data to be written outside the intended cache location or to an unsafe destination name. This issue is fixed in version 2.7.8.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0054 45th 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-2026-54583

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-2026-39415 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
  • TI-2026-39420 mport sample file handling can write outside the configured root CVSS 4.0MEDIUM 6.0
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences