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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (48.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-grap… (Third Party Advisory, 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.