What is CVE-2026-109354?

CVE-2026-109354 is a medium-severity vulnerability in Librenms, classified under Path Traversal. CVSS score: 4.3/10. Published 2026-10-12.

How severe is CVE-2026-109354?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Path Traversal in Librenms

CVE-2026-109354

LibreNMS before 26.9.0 contains a path traversal vulnerability in nfsen_channel_common.inc.php that allows authenticated users to read unauthorized RRD data by injecting ../ sequences into the channel parameter. Attackers with access to one NFSen-enabled device can request graph.php with a traversed channel value to view traffic and NetFlow graphs of devices outside their authorized scope.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Librenms

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/librenms/librenms/security/advisories/GHSA-j3qf-h24w-9f42 (vendor-advisory)
www.vulncheck.com/advisories/librenms-before-26.9.0-path-traversal-via-nfsen-ch… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109354?: CVE-2026-109354 is a medium-severity vulnerability in Librenms, classified under Path Traversal. CVSS score: 4.3/10. Published 2026-10-12.
How severe is CVE-2026-109354?: Medium severity. CVSS v3 base score is 4.3 out of 10.