CVE-2026-54581

mport bootstrap index fetch can continue after hash verification failure

HIGH
8.3
CVSS Score
Published: September 17, 2026 at 04:45 PM UTC
Updated: September 17, 2026 at 09:27 PM UTC
1 product affected across 1 vendorMport

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Severity
HIGH8.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.7.8
Affected range stops below 2.7.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.3HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-345CWE-347

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