CVE-2026-86427: Librenms

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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: before 26.8.0 (fixed in 26.8.0)

Published 2026-09-07. Last modified 2026-09-18.