# CVE-2026-84190: LibreNMS AboutController remote code execution in snmpget configuration

Source: https://junglewise.ai/threats/cve-2026-84190-librenms-aboutcontroller-remote-code-execution-in-snmpget  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-01. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-84190 · Severity: high · CVSS 7.2 · Published 2026-09-01

LibreNMS is an open-source network monitoring platform used by organizations to track and manage network devices and services. A vulnerability in the AboutController allows authenticated administrators to execute arbitrary code on the web server by modifying the snmpget configuration parameter to point to a malicious executable. Successful exploitation results in complete server compromise, enabling attackers to steal credentials, create backdoors, and disrupt monitoring operations.

Technologies: [Librenms](https://junglewise.ai/threats/technologies/librenms), [librenms/librenms (Packagist)](https://junglewise.ai/threats/technologies/librenms-librenms). Vendors: [Librenms](https://junglewise.ai/threats/vendors/librenms), [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-84190 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-84190 being exploited in the wild.

**How severe is CVE-2026-84190?** High severity, with a CVSS score of 7.2, published 1 September 2026.

**Which products and versions are affected?** Librenms before 26.5.0; librenms/librenms (Packagist) ECOSYSTEM:introduced=0,fixed=26.5.0.

**Is there a fix for CVE-2026-84190?** Yes. librenms/librenms (Packagist): upgrade to 26.5.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-84190 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-84190?** Check whether you run Librenms or librenms/librenms (Packagist) 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

- librenms/librenms (Packagist): upgrade to 26.5.0 or later

  ```sh
  composer require librenms/librenms:^26.5.0
  ```


## Technical details

The vulnerability exists in LibreNMS's AboutController (app/Http/Controllers/AboutController.php line 85), where the snmpget configuration value is retrieved from the database and passed directly to shell_exec() without proper validation. While a sanitizePath() function attempts to block special characters (;, `, #, $, |, &, ', ", >, <, parentheses), it only prevents direct command injection and does NOT validate the destination of the executable path. An authenticated administrator can bypass this by modifying the snmpget configuration via the web interface (/settings/snmpget) to point to a pre-existing malicious executable on the system, then trigger execution by accessing the /about endpoint. The fix requires replacing shell_exec() with Symfony's Process component to properly separate command arguments from executable paths.

## Affected products

- LibreNMS LibreNMS before 26.5.0

## Identifiers

- CVE-2026-84190
- GHSA-jf24-8g2h-2wg7

## Timeline

- 2026-08-04: disclosed
- 2026-09-01: advisory
- 2026-09-01: patched: Version 26.5.0 released

## References

- [https://github.com/librenms/librenms/security/advisories/GHSA-jf24-8g2h-2wg7](https://github.com/librenms/librenms/security/advisories/GHSA-jf24-8g2h-2wg7)
- [https://www.vulncheck.com/advisories/librenms-before-26.5.0-remote-code-execution-via-aboutcontroller](https://www.vulncheck.com/advisories/librenms-before-26.5.0-remote-code-execution-via-aboutcontroller)

## Related threats

- [LibreNMS LDAP filter injection in external authorization modes](https://junglewise.ai/threats/cve-2026-109357-librenms-before-26-9-0-contains-an-ldap-filter-injection-in-ldap)
- [LibreNMS missing authorization in PortsController::purge](https://junglewise.ai/threats/cve-2026-109356-librenms-before-26-9-0-contains-a-missing-authorization)
- [LibreNMS stored cross-site scripting in Oxidized node list](https://junglewise.ai/threats/cve-2026-109355-librenms-before-26-9-0-contains-a-stored-cross-site-scripting)
- [LibreNMS path traversal in NFSen channel parameter](https://junglewise.ai/threats/cve-2026-109354-librenms-before-26-9-0-contains-a-path-traversal-vulnerability)
- [LibreNMS SQL injection in notifications.inc.php](https://junglewise.ai/threats/cve-2026-109353-librenms-before-26-9-0-contains-an-sql-injection-vulnerability)