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Advisory record · GHSA-c9fv-cgmm-2wg7

LibreNMS Vulnerable to Remote Code Execution by Signal Alert Transportation module

CVSS 8.6 HighEPSS 0.016 · 76th percentile

Published by the GitHub Advisory Database at 18 Aug 2026, 17:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
librenms/librenmsPackagist>=21.6.0, <26.5.026.5.0
Identifiers
GHSA-c9fv-cgmm-2wg7 · CVE-2026-55182 · PKSA-8dtq-rfyc-264h
Weakness (CWE)
CWE-77
Tags
Published
18 Aug 2026
Updated
18 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

LibreNMS versions from 21.6.0 before 26.5.0 are vulnerable to remote code execution through the Signal alert transport module. An authenticated administrator who adds an alert transport entry can inject commands via the Signal path and recipient fields, which are not properly escaped before being passed to exec calls. Upgrade to LibreNMS 26.5.0 or later. The source gives no workaround beyond limiting who holds administrator access.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.6 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.016, the 76th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.