CVE-2026-41451 tclahr CVE debrief

Who should care

Analysts and users of UAC versions prior to 3.3.0 should be aware of this vulnerability and take necessary actions to patch or mitigate it. Affected operators, platforms, vulnerability-management, and security teams should review the vulnerability and implement necessary controls. Compensating controls for exposed systems should be reviewed while remediation is scheduled and verified. Relevant monitoring, detection, and logs for exposed assets should be checked for extra review. Exceptions, retested remediated assets, and closed items should be tracked only after evidence is documented. Asset inventory and source tracking can help with vulnerability management. Rollback and change windows can help with remediation planning. Security teams should prioritize patching or mitigating this vulnerability to prevent potential arbitrary command execution. Vulnerability management teams should review and implement necessary controls to prevent exploitation. Operators and administrators should review and implement necessary controls to prevent exploitation. Platform owners should review and implement necessary controls to prevent exploitation. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified. Security teams should check relevant monitoring, detection, and logs for exposed assets that need extra review. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Security teams should implement additional input validation and sanitization to prevent exploitation. Security teams should restrict access to /etc/passwd to prevent exploitation. Security teams should monitor for suspicious activity in parse_artifact.sh to prevent exploitation. Security teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Security teams should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Security teams should review 7

Technical summary

UAC versions prior to 3.3.0 contain a command injection vulnerability in the user substitution logic within parse_artifact.sh. Usernames and home directories from /etc/passwd are substituted directly into command strings without escaping before execution via eval, allowing attackers to inject shell metacharacters and execute arbitrary commands. This vulnerability can be mitigated by patching UAC to version 3.3.0 or later, restricting access to /etc/passwd, monitoring for suspicious activity in parse_artifact.sh, and implementing additional input validation and sanitization.

Defensive priority

UAC versions prior to 3.3.0 are vulnerable to command injection via user substitution in parse_artifact.sh. Analysts should prioritize patching or mitigating this vulnerability to prevent potential arbitrary command execution.

Recommended defensive actions

• Patch UAC to version 3.3.0 or later
• Mitigate by restricting access to /etc/passwd
• Monitor for suspicious activity in parse_artifact.sh
• Implement additional input validation and sanitization
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The vulnerability exists in UAC versions prior to 3.3.0, specifically in the parse_artifact.sh script where usernames and home directories from /etc/passwd are substituted directly into command strings without escaping before execution via eval. This allows attackers to inject shell metacharacters through crafted usernames or home directory paths to execute arbitrary commands.

Official resources