CVE-2026-86427

EUVD-2026-72385
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.
Command Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 25.07%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
librenmslibrenms
𝑥
< 26.8.0
CNA
Common Weakness Enumeration
References
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