# CVE-2026-86427

## Summary

- **CVE ID:** CVE-2026-86427
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-77
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 7, 2026

## Description

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 Products

- librenms — librenms (0)
- librenms — librenms (26.8.0)

## References

- [CNA](https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83)
- [CNA](https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 25.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._