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.

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