CVE-2026-106056 rundeck CVE debrief

Who should care

Defenders managing Rundeck instances, especially those with authenticated users having job run permissions, should assess exposure and potential impact. They should prioritize verification and mitigation to prevent potential command injection and lateral movement. This includes verifying Rundeck version and user permissions, monitoring for suspicious activity on Windows nodes, and reviewing compensating controls for exposed systems.

Why it matters

CVE-2026-106056 is a high-severity vulnerability in Rundeck before 6.2.0, allowing authenticated users to inject OS commands on Windows nodes. Defenders should prioritize verification and mitigation to prevent potential command injection and lateral movement.

• Potential command injection with node executor credential privileges
• Possible lateral movement within the network
• Need for verification of Rundeck version and user permissions
• Potential for data breaches or system compromise

Technical summary

The vulnerability allows authenticated users with job run permission to execute OS commands on Windows nodes by supplying crafted option values. CLIUtils.quoteWindowsCMDArg wraps these values in ineffective single quotes, enabling command injection with node executor credential privileges. This can lead to potential command injection, lateral movement, and data breaches or system compromise. Defenders should prioritize verifying exposure and assessing potential impact, focusing on Rundeck instances before version 6.2.0, especially those with authenticated users having job run permissions.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, focusing on Rundeck instances before version 6.2.0, especially those with authenticated users having job run permissions.

Recommended defensive actions

• Verify Rundeck version and upgrade to 6.2.0 or later if necessary
• Restrict job run permissions to minimize potential impact
• Monitor for suspicious activity on Windows nodes
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the OS command injection vulnerability in Rundeck before 6.2.0, allowing authenticated users to execute commands on Windows nodes. The vulnerability is caused by CLIUtils.quoteWindowsCMDArg wrapping option values in ineffective single quotes. Defenders should verify Rundeck version and user permissions, and monitor for suspicious activity on Windows nodes.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.