CVE-2026-86427
LibreNMS before 26.8.0 Argument Injection via graph_title
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 7, 2026
- Updated
- Sep 10, 2026
- Reserved
- Sep 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Products
| Product | Versions |
|---|---|
librenmslibrenms |
|
References
- GitHub Security Advisory (GHSA-3hvv-wxpw-cx83)vendor-advisory
- VulnCheck Advisory: LibreNMS before 26.8.0 Argument Injection via graph_titlethird-party-advisory
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