CVE-2026-14852 Overview
CVE-2026-14852 is a local privilege escalation vulnerability in the Checkmk monitoring platform. The flaw resides in the mk_sap_hana agent plugin, which derives SAP HANA instance identifiers from the running process list when no explicit database configuration is present. A local unprivileged user can start a process crafted to look like a SAP HANA instance and cause the plugin to execute arbitrary commands as root. Exploitation requires the plugin to run as root with RUNAS=agent. The issue is tracked under CWE-78: OS Command Injection.
Critical Impact
A local unprivileged user can achieve arbitrary command execution as root on Checkmk-monitored hosts that run the mk_sap_hana plugin without an explicit database configuration.
Affected Products
- Checkmk 2.5.0 before 2.5.0p9
- Checkmk 2.4.0 before 2.4.0p34
- Checkmk 2.3.0 before 2.3.0p49
- Checkmk 2.2.0 (End of Life)
Discovery Timeline
- 2026-07-14 - CVE-2026-14852 published to NVD
- 2026-07-15 - Last updated in NVD database
Technical Details for CVE-2026-14852
Vulnerability Analysis
The mk_sap_hana agent plugin monitors SAP HANA database instances on hosts running the Checkmk agent. When administrators do not provide an explicit database configuration, the plugin discovers instances dynamically by parsing the local process list. The plugin extracts instance identifiers from process names and uses them to construct commands executed with elevated privileges.
Because the derived identifiers become part of a shell-executed command, a local user who can spawn a process with an attacker-chosen name can influence the command string. The plugin runs under root when configured with RUNAS=agent, so the injected command inherits root privileges. This results in full local privilege escalation from any unprivileged shell.
Root Cause
The root cause is improper neutralization of special elements used in an OS command [CWE-78]. The plugin trusts process metadata as a source of instance identifiers and passes those values into a shell invocation without sanitizing shell metacharacters. Any user able to create a process on the monitored host controls the input to a privileged command.
Attack Vector
Exploitation requires local access to a host running the Checkmk agent with the vulnerable mk_sap_hana plugin enabled and no explicit database configuration. The attacker creates a process whose name matches the pattern the plugin uses to identify SAP HANA instances. The crafted identifier includes shell metacharacters or command separators. When the plugin next executes, it builds and runs a command containing the attacker-supplied payload as root.
Refer to the Checkmk Security Update (Werk 20104) for the vendor's technical description.
Detection Methods for CVE-2026-14852
Indicators of Compromise
- Unexpected child processes spawned by the Checkmk agent or the mk_sap_hana plugin running as root.
- Processes with names that mimic SAP HANA instance patterns but originate from unprivileged user sessions.
- Shell metacharacters or command separators appearing in process command lines that are subsequently referenced by agent plugin executions.
Detection Strategies
- Audit process creation events on hosts running the Checkmk agent, correlating child processes of mk_sap_hana with their parent user context.
- Alert on mk_sap_hana plugin execution that produces child processes unrelated to legitimate SAP HANA management binaries.
- Review Checkmk agent logs for instance identifiers containing unusual characters such as ;, |, `, or $(.
Monitoring Recommendations
- Enable Linux auditd rules on execve calls made by the Checkmk agent user and by root-owned plugin executions.
- Monitor for privilege transitions where an unprivileged user's activity precedes a root-context command execution triggered by the agent.
- Track deployment of the mk_sap_hana plugin across the fleet and identify hosts lacking an explicit database configuration.
How to Mitigate CVE-2026-14852
Immediate Actions Required
- Upgrade Checkmk to a fixed release: 2.5.0p9, 2.4.0p34, or 2.3.0p49.
- Migrate off Checkmk 2.2.0, which is end of life and will not receive a patch.
- Inventory all hosts running the mk_sap_hana plugin and confirm whether an explicit database configuration is defined.
Patch Information
Checkmk released fixes documented in Werk 20104. Apply version 2.5.0p9, 2.4.0p34, or 2.3.0p49 depending on the deployed branch. Version 2.2.0 is end of life and users must upgrade to a supported branch to receive the fix.
Workarounds
- Provide an explicit database configuration to the mk_sap_hana plugin so instance identifiers are not derived from the process list.
- Remove or disable the mk_sap_hana plugin on hosts that do not require SAP HANA monitoring.
- Restrict local shell access on monitored hosts to trusted users only, reducing the population able to spawn crafted processes.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
