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CVE-2026-54587— mport directory asset installation is vulnerable to symlink and path traversal races

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.

mport 是 MidnightBSD 的包管理器。在 2.7.8 版本之前，libmport/bundle_read_install_pkg.c 中以 ASSET_DIR 或 ASSET_DIR_OWNER_MODE 方式处理的目录资源，使用的是基于路径的 mport_mkdirp() 函数，并执行所有权和权限操作。如果本地攻击者能够修改目标安装目录树的部分内容，则可在进行特权包安装过程中，利用路径穿越（如“../”）或替换符号链接，使目录创建或属性变更操作影响攻击者指定的、位于预期包目录之外的路径。该问题已在

CVSS 5.8 · Medium

Possible ATT&CK Techniques 1 AI

T1560 · Archive Collected Data
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I. Basic Information for CVE-2026-54587

Vulnerability Information
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Vulnerability Title
mport directory asset installation is vulnerable to symlink and path traversal races
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, directory assets handled as ASSET_DIR or ASSET_DIR_OWNER_MODE in libmport/bundle_read_install_pkg.c used path-based mport_mkdirp(), ownership, and permission operations. A local attacker able to modify part of the target installation tree could use dot-dot traversal or substitute symlinks during privileged package installation, causing directory creation or attribute changes to affect attacker-selected paths outside the intended package directories. This issue is fixed in version 2.7.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MidnightBSD mport < 2.7.8 -

II. Public POCs for CVE-2026-54587

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III. Intelligence Information for CVE-2026-54587

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Patches & Fixes for CVE-2026-54587 (2)

Vendor Advisories for CVE-2026-54587 (1)

Other References for CVE-2026-54587 (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-2026-54582 6.0 MEDIUM mport package installation can overwrite existing unmanaged or differently owned files
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-2026-54576 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-59

V. Comments for CVE-2026-54587

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