Vulnerability · Published Sep 7, 2026 · Assigned by VulnCheck

CVE-2026-86427LibreNMS before 26.8.0 Argument Injection via graph_title

High 8.8

In plain English

A high-severity command injection in librenms from librenms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.6%top 50.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
librenms	librenms	0 – before 26.8.0

Weakness: CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-3hvv-wxpw-cx83) vendor-advisory
VulnCheck Advisory: LibreNMS before 26.8.0 Argument Injection via graph_title third-party-advisory