High 8.3Published Sep 17, 2026

CVE-2026-54580mport index decompression can leave partial or corrupt index data after zstd failures

Updated under an hour ago (2026-10-19 08:50 UTC)

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It affects MidnightBSD mport. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for MidnightBSD mport

Exploited in the last 30 days

mport is the MidnightBSD Package Manager. Prior to 2.7.8, libmport/util.c did not make every truncated, corrupt, or failed zstd stream fatal in mport_decompress_zstd(), and libmport/fetch.c did not consistently propagate those failures to index-fetch callers. A malicious or faulty mirror could supply compressed package index data that caused ZSTD_decompressStream() or an output write to fail while leaving partial index output available for later use, resulting in package-index integrity loss or denial of service. This issue is fixed in version 2.7.8.

CVSS: 8.3 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-354, CWE-755
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

MidnightBSD mport midnightbsd:mport (from the name)	before 2.7.8	CNA record

References

https://github.com/MidnightBSD/mport/security/advisories/GHSA-ffqj-j42r-747wx-refsource-confirm
https://github.com/MidnightBSD/mport/pull/135x-refsource-misc
https://github.com/MidnightBSD/mport/commit/b3e11ba078351402082a881209ee6fda5d332e3dx-refsource-misc
https://github.com/MidnightBSD/mport/releases/tag/2.7.8x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.