← Vulnerability feed

Vulnerability record · CVE-2026-55182 · published 26 August 2026

CVE-2026-55182: Command injection vulnerability

LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is vulnerable to command injection because the signal-cli path and the Recipient field of an alert transport entry are insufficiently escaped before being passed to an exec call. An authenticated administrator can craft a transport entry whose Recipient contains shell metacharacters and whose path points to the bundled composer_wrapper.php script, which itself passes attacker-controlled input to further unsafe exec calls. By chaining these calls, the administrator can execute arbitrary operating-system commands on the LibreNMS host. This issue is fixed in version 26.5.0.

8.6 CVSS 4.0 High EPSS 1.6% · top 25.1% CWE-77 · Command injection Deferred
8.6CVSS 4.0 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
9 Sep 2026Last modified by NVD

Description

LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is vulnerable to command injection because the signal-cli path and the Recipient field of an alert transport entry are insufficiently escaped before being passed to an exec call. An authenticated administrator can craft a transport entry whose Recipient contains shell metacharacters and whose path points to the bundled composer_wrapper.php script, which itself passes attacker-controlled input to further unsafe exec calls. By chaining these calls, the administrator can execute arbitrary operating-system commands on the LibreNMS host. This issue is fixed in version 26.5.0.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/librenms/librenms/commit/868e3b966a
https://github.com/librenms/librenms/releases/tag/26.5.0
https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7
https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7

Track CVE-2026-55182 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-8037Progress LoadMaster API OS Command Injection RCEProgress LoadMaster (and related ADC products) contain an OS command injection flaw in multiple API command endpoints where unsanitized input is pass…KEVEPSS 77%analysed8.7CVE-2026-42271LiteLLM MCP test endpoints allow authenticated OS command injectionLiteLLM versions 1.74.2 through before 1.83.7 expose two MCP preview endpoints (POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list) th…KEVEPSS 13%analysed7.2CVE-2025-29635D-Link DIR-823X command injection in set_prohibiting handlerD-Link DIR-823X firmware (240126 and 240802) contains a command injection flaw in the /goform/set_prohibiting POST handler. An attacker who already h…KEVEPSS 88%analysed8.1CVE-2026-22719VMware Aria Operations command injection during support-assisted migrationVMware Aria Operations contains a command injection flaw (CWE-77) that an unauthenticated attacker can use to run arbitrary commands, potentially ach…KEVEPSS 18%analysed8.7CVE-2025-4008Meteobridge web interface command injection without authenticationThe Meteobridge web interface, built from CGI shell scripts and C, exposes an endpoint vulnerable to command injection. Because the endpoint also lac…KEVEPSS 94%analysed6.1CVE-2025-59689Libraesva ESG command injection via compressed email attachmentLibraesva Email Security Gateway versions 4.5 through 5.5.x before 5.5.7 are vulnerable to command injection triggered by a compressed email attachme…KEVEPSS 1.9%analysed9.8CVE-2025-10035Fortra GoAnywhere MFT License Servlet deserialization to command injectionThe License Servlet in Fortra GoAnywhere MFT deserializes untrusted data, and an attacker who can present a validly forged license response signature…KEVEPSS 100%analysed8.8CVE-2020-25079D-Link DCS cameras authenticated command injection in ddns_enc.cgiD-Link DCS-2530L (before 1.06.01 Hotfix) and DCS-2670L (through 2.02) contain an authenticated command injection flaw in cgi-bin/ddns_enc.cgi. A user…KEVEPSS 54%analysed

Source: NIST National Vulnerability Database (record CVE-2026-55182), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.