What is CVE-2026-86427?

CVE-2026-86427 is a high-severity vulnerability in Librenms, classified under Command Injection. CVSS score: 8.8/10. Published 2026-09-07.

How severe is CVE-2026-86427?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Librenms

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.

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Librenms

Weakness classification (CWE)

CWE-77 — Command Injection

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-86427?: CVE-2026-86427 is a high-severity vulnerability in Librenms, classified under Command Injection. CVSS score: 8.8/10. Published 2026-09-07.
How severe is CVE-2026-86427?: High severity. CVSS v3 base score is 8.8 out of 10.