CVE-2026-54584

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 62% 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
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

mport is the MidnightBSD Package Manager. mport before 2.7.8 used TMPDIR while extracting package metafiles, including when running as root or in setuid/setgid contexts. An attacker able to control the environment for a privileged mport invocation could redirect temporary metadata extraction to an attacker-controlled location. PR 123 ignores unsafe TMPDIR values in privileged contexts and rejects empty TMPDIR. This issue has been patched in version 2.7.8.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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 computed
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

September 21, 2026

Last Modified

September 23, 2026

Advisory Details (4)

Auto-updated Sep 21, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

mport 2.7.8

Patch available: MidnightBSD/mport 2.7.8

https://github.com/MidnightBSD/mport/releases/tag/2.7.8
github_commit Patch Available

commit 3790fa49a36c (MidnightBSD/mport)

Patch available: MidnightBSD/mport 2.7.8 (contains commit 3790fa49a36c)

https://github.com/MidnightBSD/mport/commit/3790fa49a36cb085f48b204ef189fb82bbee621a
github_pr Patch Available

Harden privileged metafile tempdir selection

Patch available: MidnightBSD/mport 2.7.8 (PR #123 merged 2026-05-14)

https://github.com/MidnightBSD/mport/pull/123
github Patch Available

mport trusts environment-controlled temporary directories in privileged metadata extraction · Advisory · MidnightBSD/mport · GitHub

Affected: 2.7.8

https://github.com/MidnightBSD/mport/security/advisories/GHSA-4vv3-3h8r-q6mq

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× 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.

  1. 2026-09-24 15:04 UTCEG score recompute
  2. 2026-09-24 14:04 UTCEPSS rescore
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-23 10:42 UTCEG score recompute
  5. 2026-09-21 15:22 UTCEG score recompute
  6. 2026-09-21 14:25 UTCEG score recompute
  7. 2026-09-21 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54584?
CVE-2026-54584 is a medium vulnerability published on September 21, 2026. mport is the MidnightBSD Package Manager. mport before 2.7.8 used TMPDIR while extracting package metafiles, including when running as root or in setuid/setgid contexts. An attacker able to control the environment for a privileged mport invocation could redirect temporary metadata extraction to an…
When was CVE-2026-54584 disclosed?
CVE-2026-54584 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54584 actively exploited?
CVE-2026-54584 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.4% of all scored CVEs.
What is the CVSS score of CVE-2026-54584?
CVE-2026-54584 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-54584?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54584, 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-2026-54584

Explore →

Is Your Infrastructure Affected by CVE-2026-54584?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs