mport is the MidnightBSD Package Manager. Prior to 2.7.8, the mport_fetch_bootstrap_index() function in libmport/fetch.c could return success when bootstrap index hash verification encountered a missing or invalid hash because the failure path did not preserve a fatal result. A network attacker or compromised mirror able to alter bootstrap index content or its transport path could therefore cause mport to proceed with an unverified or tampered bootstrap package index. This issue is fixed in version 2.7.8.
CVE-2026-54581
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: 0.2%, top 89% 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: 0%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
- 37(Track)EG Risk 37/100SSVC: 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%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 11%
- KEV
- Not listed
Published
September 17, 2026
Last Modified
September 17, 2026
Advisory Details (6)
Auto-updated Sep 17, 2026Patch available. Sources: github, github_pr, github_commit, github_release.
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 b3e11ba07835 (MidnightBSD/mport)
Patch available: MidnightBSD/mport 2.7.8 (contains commit b3e11ba07835)
https://github.com/MidnightBSD/mport/commit/b3e11ba078351402082a881209ee6fda5d332e3dgithub_commit Patch Available
commit 64ebf3f60dc3 (MidnightBSD/mport)
Patch available: MidnightBSD/mport 2.7.8 (contains commit 64ebf3f60dc3)
https://github.com/MidnightBSD/mport/commit/64ebf3f60dc3df72a3b47fbb20a7f8072c0a0f5egithub_pr Patch Available
Harden zstd decompression and propagate failures to index fetch
Patch available: MidnightBSD/mport 2.7.8 (PR #135 merged 2026-05-15)
https://github.com/MidnightBSD/mport/pull/135github_pr Patch Available
Fix bootstrap index hash verification failure handling
Patch available: MidnightBSD/mport 2.7.8 (PR #134 merged 2026-05-15)
https://github.com/MidnightBSD/mport/pull/134github Patch Available
mport bootstrap index fetch can continue after hash verification failure · Advisory · MidnightBSD/mport · GitHub
Affected: 2.7.8
https://github.com/MidnightBSD/mport/security/advisories/GHSA-895r-rv8j-7g23Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 8× 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 18:02 UTCEG score recompute
- 2026-09-18 19:41 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-17 20:18 UTCEG score recompute
- 2026-09-17 19:20 UTCEG score recompute
- 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-2026-54581?
CVE-2026-54581 is a high vulnerability published on September 17, 2026. mport is the MidnightBSD Package Manager. Prior to 2.7.8, the mportfetchbootstrap_index() function in libmport/fetch.c could return success when bootstrap index hash verification encountered a missing or invalid hash because the failure path did not preserve a fatal result. A network attacker or…
When was CVE-2026-54581 disclosed?
CVE-2026-54581 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-2026-54581 actively exploited?
CVE-2026-54581 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 88.7% of all scored CVEs.
What is the CVSS score of CVE-2026-54581?
CVE-2026-54581 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-54581?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54581, 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-2026-54581
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