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CVE-2026-54579— mport mirror-selection ping accepts insufficiently validated ICMP replies

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 之前的版本中， 中的 函数在接收 ICMP 回复时，未验证 或 ，并使用固定的 IP 头偏移量（而非根据 动态计算）来解析回复。能够注入或伪造可见的 ICMP 回复的网络攻击者可能会影响镜像延迟的选择；此外，带有 IP 选项的格式错误的数据包可能会使 ICMP 头部发生偏移，从而触发越界读取（out-of-bounds read）。该问题已在 2.7.8 版本中修复。

CVSS 2.3 · Low
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I. Basic Information for CVE-2026-54579

Vulnerability Information
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Vulnerability Title
mport mirror-selection ping accepts insufficiently validated ICMP replies
Source: CVE Program / CVE List V5
Vulnerability Description
mport is the MidnightBSD Package Manager. Prior to 2.7.8, ping() in libmport/ping.c accepted ICMP replies without validating icmp_id or icmp_seq and parsed the reply using a fixed IP-header offset instead of ip_hl. A network attacker able to inject or spoof visible ICMP replies could influence mirror latency selection, while a malformed packet carrying IP options could shift the ICMP header and trigger an out-of-bounds read. This issue is fixed in version 2.7.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MidnightBSD mport < 2.7.8 -

II. Public POCs for CVE-2026-54579

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III. Intelligence Information for CVE-2026-54579

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Vendor Advisories for CVE-2026-54579 (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-2026-54577 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-125

V. Comments for CVE-2026-54579

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