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CVE-2026-54583— mport package bundle downloads allow unsafe destination filenames

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/fetch.c 并未始终如一地拒绝包含空值、点（.）、双点（..）或斜杠（/）的 bundle 文件名，然后才组合包下载和写入路径。恶意的包索引数据可能在 indexEntry->bundlefile 中放置一个不安全的值，而由于缺少 is_valid_bundle_filename() 检查，允许下载的包数据被写入预定缓存位置之外或不安全的目标名称。此问题已在 2.7.8 版本中修复。

CVSS 8.3 · High
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I. Basic Information for CVE-2026-54583

Vulnerability Information
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Vulnerability Title
mport package bundle downloads allow unsafe destination filenames
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, libmport/fetch.c did not consistently reject empty, dot, dot-dot, or slash-containing bundle filenames before composing package download and write paths. Malicious package index data could place an unsafe value in indexEntry->bundlefile, and the missing is_valid_bundle_filename() checks allowed downloaded package data to be written outside the intended cache location or to an unsafe destination name. 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:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MidnightBSD mport < 2.7.8 -

II. Public POCs for CVE-2026-54583

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III. Intelligence Information for CVE-2026-54583

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Other References for CVE-2026-54583 (4)

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

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-2026-54587 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-22

V. Comments for CVE-2026-54583

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