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CVE-2026-54580— mport index decompression can leave partial or corrupt index data after zstd failures

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 2.7.8 之前， 中的 函数未将每一个被截断、损坏或失败的 zstd 流视为致命错误，且 也未一致地将这些故障传递给索引获取（index-fetch）的调用者。 恶意或存在缺陷的软件镜像源可能提供经过压缩的包索引数据，导致 或输出写入失败，同时仍保留部分索引输出供后续使用，从而引发包索引完整性受损或服务拒绝（DoS）。该问题已在 2.7.8 版本中修复。

CVSS 8.3 · High

Possible ATT&CK Techniques 1 AI

T1205 · Traffic Signaling

Affected Version Matrix 1

VendorProduct Version RangeStatus
MidnightBSD mport < 2.7.8 affected
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I. Basic Information for CVE-2026-54580

Vulnerability Information
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Vulnerability Title
mport index decompression can leave partial or corrupt index data after zstd failures
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, libmport/util.c did not make every truncated, corrupt, or failed zstd stream fatal in mport_decompress_zstd(), and libmport/fetch.c did not consistently propagate those failures to index-fetch callers. A malicious or faulty mirror could supply compressed package index data that caused ZSTD_decompressStream() or an output write to fail while leaving partial index output available for later use, resulting in package-index integrity loss or denial of service. 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:L/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MidnightBSD mport < 2.7.8 -

II. Public POCs for CVE-2026-54580

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III. Intelligence Information for CVE-2026-54580

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Vendor Advisories for CVE-2026-54580 (1)

Other References for CVE-2026-54580 (3)

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-2026-54582 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-354

V. Comments for CVE-2026-54580

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