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CVE-2026-86427

8.8 · HIGH

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-…

Published Sep 7, 2026librenmsCWE-77EPSS 0.60%

Overview

CVE-2026-86427 is a high-severity vulnerability affecting librenms librenms. It was published on September 7, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from librenms. Update librenms to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
librenmslibrenms>= 0, < 26.8.0Affected

References

GitHubgithub.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83Refwww.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title

How CyberStrike helps

Frequently asked questions

What is CVE-2026-86427?

CVE-2026-86427 is a high-severity vulnerability affecting librenms librenms. It was published on September 7, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-86427?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-86427?

Check the references section for vendor advisories and patches from librenms. Update librenms to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-86427?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-86427 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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