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CVE-2026-54582— mport package installation can overwrite existing unmanaged or differently owned files

Quick assessment

Affected
MidnightBSD mport
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

是 MidnightBSD 的包管理器。在版本 2.7.8 之前，包安装过程中缺少对已存在于磁盘上的非目录资产（如普通文件）的预检查。受影响的逻辑位于 、 和 中，这些代码未应用 检查，因此，经过构造或存在冲突的包可能会覆盖由其他包拥有或未被 管理的文件。该检查仅在操作者显式启用 时被绕过。若未设置该强制覆盖选项，而执行具有特权的安装操作，可能会破坏本地文件系统完整性以及包数据库的一致性。此问题已在版本 2.7.8 中修复。

CVSS 6.0 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
MidnightBSD mport < 2.7.8 affected
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I. Basic Information for CVE-2026-54582

Vulnerability Information
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Vulnerability Title
mport package installation can overwrite existing unmanaged or differently owned files
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, package installation lacked a preflight check for incoming non-directory assets that already existed on disk. The affected logic across libmport/check_preconditions.c, libmport/install_primative.c, and libmport/mport_private.h did not apply MPORT_PRECHECK_FILE_CONFLICTS, so a crafted or conflicting package could overwrite a file owned by another package or unmanaged by mport. The check is bypassed only when the operator explicitly enables mport->force. Privileged installation without that override could compromise local filesystem integrity and package database consistency. This issue is fixed in version 2.7.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MidnightBSD mport < 2.7.8 -

II. Public POCs for CVE-2026-54582

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III. Intelligence Information for CVE-2026-54582

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Patches & Fixes for CVE-2026-54582 (2)

Vendor Advisories for CVE-2026-54582 (1)

Other References for CVE-2026-54582 (1)

Same Patch Batch · MidnightBSD · 2026-09-17 · 12 CVEs total

CVE-2026-54583 8.3 HIGH mport package bundle downloads allow unsafe destination filenames
CVE-2026-54581 8.3 HIGH mport bootstrap index fetch can continue after hash verification failure
CVE-2026-54580 8.3 HIGH mport index decompression can leave partial or corrupt index data after zstd failures
CVE-2026-54585 6.0 MEDIUM mport sample file handling can write outside the configured root
CVE-2026-54586 6.0 MEDIUM mport permits repository and package mirror fetches over insecure transport
CVE-2026-54587 5.8 MEDIUM mport directory asset installation is vulnerable to symlink and path traversal races
CVE-2026-54576 5.8 MEDIUM mport package installation has symlink TOCTOU in chown and chmod handling
CVE-2026-54575 5.8 MEDIUM mport package fetch and clean paths are vulnerable to TOCTOU filesystem races
CVE-2026-54579 2.3 LOW mport mirror-selection ping accepts insufficiently validated ICMP replies
CVE-2026-54577 2.0 LOW mport audit can inspect the wrong package when options are present
CVE-2026-54578 2.0 LOW mport verify can compare stale checksum data after hashing failures

IV. Related Vulnerabilities

Same product: mport
Same vendor: MidnightBSD
Same weakness: CWE-73

V. Comments for CVE-2026-54582

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