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CVE-2026-54581— mport bootstrap index fetch can continue after hash verification failure

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 中的 mport_fetch_bootstrap_index() 函数在遇到缺失或无效的引导索引哈希值时，可能返回成功，因为其失败路径未保留致命错误状态。因此，能够篡改引导索引内容或其传输路径的网络攻击者或被攻陷的镜像服务器，可能导致 mport 基于未经过验证或已被篡改的引导包索引继续执行。该问题已在 2.7.8 版本中修复。

CVSS 8.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-54581

Vulnerability Information
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Vulnerability Title
mport bootstrap index fetch can continue after hash verification failure
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, the mport_fetch_bootstrap_index() function in libmport/fetch.c could return success when bootstrap index hash verification encountered a missing or invalid hash because the failure path did not preserve a fatal result. A network attacker or compromised mirror able to alter bootstrap index content or its transport path could therefore cause mport to proceed with an unverified or tampered bootstrap package index. 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
对数据真实性的验证不充分
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MidnightBSD mport < 2.7.8 -

II. Public POCs for CVE-2026-54581

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III. Intelligence Information for CVE-2026-54581

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Other References for CVE-2026-54581 (6)

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-2026-54580 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-345

V. Comments for CVE-2026-54581

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