CVE-2026-86427
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.
- Published Sep 7, 2026
- CVSS 8.7 high
- 0.6% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available