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CVE-2026-54578— mport verify can compare stale checksum data after hashing 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.

mport 是 MidnightBSD 的包管理器。在 2.7.8 版本之前， 中的 函数在 或 哈希计算失败后，可能会继续执行后续逻辑，并使用哈希缓冲区中残留的旧数据与预期校验值进行比较，而不是使用新计算出的摘要。能够影响已安装文件内容或导致哈希计算失败的外部攻击者，可能会获得具有误导性的完整性验证结果，或者掩盖校验失败的实际情况。该问题已在 2.7.8 版本中修复。

CVSS 2.0 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
MidnightBSD mport < 2.7.8 affected
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I. Basic Information for CVE-2026-54578

Vulnerability Information
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Vulnerability Title
mport verify can compare stale checksum data after hashing failures
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, mport_verify_package() in libmport/verify.c could continue after MD5File() or SHA256_File() failed and compare an expected checksum with stale data in the hash buffer rather than a newly computed digest. An attacker able to influence an installed file or the conditions that make hashing fail could receive a misleading integrity result or hide a checksum failure. This issue is fixed in version 2.7.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/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-2026-54578

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III. Intelligence Information for CVE-2026-54578

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Patches & Fixes for CVE-2026-54578 (2)

Vendor Advisories for CVE-2026-54578 (1)

Other References for CVE-2026-54578 (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-2026-54587 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

IV. Related Vulnerabilities

Same product: mport
Same vendor: MidnightBSD
Same weakness: CWE-354

V. Comments for CVE-2026-54578

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