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

What is CVE-2026-86427?

CVE-2026-86427 is a high-severity command injection vulnerability in Librenms Librenms, published on 7 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

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.

Weakness: CWE-77

Which versions are affected by CVE-2026-86427?

It affects 1 product.

Products include Librenms Librenms.

How do I fix CVE-2026-86427?

No fix has been published for CVE-2026-86427 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-86427 being exploited?

There is no known exploitation of CVE-2026-86427 in the wild and no public exploit code.

Other vulnerabilities in Librenms Librenms

• CVE-2023-4982 Cross-site Scripting (XSS) - Stored in librenms/librenms Critical 9.8
• CVE-2022-29712 Command injection in librenms Critical 9.8
• CVE-2021-44278 Path traversal in librenms/librenms Critical 9.8
• CVE-2019-10665 LibreNMS Information Disclosure Critical 9.8
• CVE-2018-20434 LibreNMS arbitrary OS commands execution Critical 9.8

All Librenms Librenms vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-3hvv-wxpw-cx83, GHSA-j7jc-m6xg-rrcw.