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.
CVE-2026-54583
HIGHPre-NVD 8.38.3—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.3Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.3
- EG Score
- 8.3(medium)
- EG Risk
- 38(Track)EG Risk 38/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity83% × 45%Exploitation1% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 43%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 17, 2026
Advisory Details (4)
Auto-updated Sep 17, 2026Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available
mport 2.7.8
Patch available: MidnightBSD/mport 2.7.8
https://github.com/MidnightBSD/mport/releases/tag/2.7.8github_commit Patch Available
commit cad959d47bc7 (MidnightBSD/mport)
Patch available: MidnightBSD/mport 2.7.8 (contains commit cad959d47bc7)
https://github.com/MidnightBSD/mport/commit/cad959d47bc79a62b6a7163800fbfe35633e7cf8github_pr Patch Available
Validate bundle filenames before download/write
Patch available: MidnightBSD/mport 2.7.8 (PR #125 merged 2026-05-15)
https://github.com/MidnightBSD/mport/pull/125github Patch Available
mport package bundle downloads allow unsafe destination filenames · Advisory · MidnightBSD/mport · GitHub
Affected: 2.7.8
https://github.com/MidnightBSD/mport/security/advisories/GHSA-mr62-mqwj-vhh3Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-19 17:19 UTCEG score recompute
- 2026-09-19 06:19 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-17 17:35 UTCEG score recompute
- 2026-09-17 16:56 UTCEG score recompute
- 2026-09-17 16:54 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-54583?
CVE-2026-54583 is a high vulnerability published on September 17, 2026. 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…
When was CVE-2026-54583 disclosed?
CVE-2026-54583 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54583 actively exploited?
CVE-2026-54583 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.0% of all scored CVEs.
What is the CVSS score of CVE-2026-54583?
CVE-2026-54583 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-54583?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54583, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54583
Is Your Infrastructure Affected by CVE-2026-54583?
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