Quick answers
- Is CVE-2026-109354 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109354 being exploited in the wild.
- How severe is CVE-2026-109354?
- Medium severity, with a CVSS score of 4.3, published 12 October 2026.
- Which products and versions are affected?
- Librenms before 26.9.0.
- Is there a fix for CVE-2026-109354?
- Yes: fixed in 26.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-109354 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-109354?
- Check whether you run Librenms at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 26.9.0
Technical details
The vulnerability exists in nfsen_channel_common.inc.php where the channel parameter is concatenated into an RRD file path without proper validation, allowing ../ sequences to traverse outside the intended directory. An authenticated user with access to one NFSen-enabled device can inject traversal sequences via graph.php to read RRD data from other devices they are not authorized to view. The sibling nfsen parameter was previously hardened against traversal, but the channel parameter was overlooked.
Affected products
- LibreNMS LibreNMS before 26.9.0
Timeline
- 2026-09-23: disclosed
- 2026-10-12: advisory