Is CVE-2026-86427 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-86427?

CVE-2026-86427 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-86427

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.