---
id: CVE-2026-86427
title: >-
  LibreNMS before 26.8.0 contains an argument injection vulnerability in the
  graph_title parameter that allows authenticated attackers to inject arbitrary
  rrdtool arguments by breaking out of double-quote escaping
summary: >-
  LibreNMS before 26.8.0 contains an argument injection vulnerability in the
  graph_title parameter that allows authenticated attackers to inject arbitrary
  rrdtool arguments by breaking out of double-quote escaping. Attackers can
  inject DEF…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-77
vendor: librenms
product: librenms
affected:
  - librenms < 26.8.0
patched:
  - librenms 26.8.0
published: '2026-09-07'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:33:07.897'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86427'
references:
  - url: >-
      https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00605
epssPercentile: 0.46701
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T14:24:54.486459Z'
ingestedAt: '2026-09-08T20:10:03.179Z'
---

## Overview

LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows authenticated attackers to inject arbitrary rrdtool arguments by breaking out of double-quote escaping. Attackers can inject DEF and LINE arguments to read RRD files from unauthorized devices, or use newline injection to execute arbitrary rrdtool commands, bypassing per-device authorization checks.

## Affected

- `librenms < 26.8.0`

## Remediation

Upgrade past the affected range:

- `librenms 26.8.0`