Attack Chain

1. Attacker crafts a malicious input containing an unquoted heredoc.
2. The heredoc body includes shell expansion tokens (e.g., ${IFS}).
3. The attacker submits the malicious input to OpenClaw.
4. OpenClaw processes the input and passes it to the vulnerable heredoc parsing logic.
5. The shell expansion tokens within the heredoc body are expanded before allowlist validation.
6. The expanded command is executed, bypassing the intended restrictions.
7. Attacker achieves arbitrary command execution on the system.

Impact

Successful exploitation of this vulnerability allows attackers to execute commands that should be blocked by the configured allowlist. This can lead to a variety of negative outcomes, including unauthorized access to sensitive data, modification of system configurations, or even complete system compromise. The severity is high due to the relative ease of exploitation (low privileges required) and the potential for significant impact on the affected system.

Recommendation

• Upgrade OpenClaw to version 2026.4.22 or later to remediate CVE-2026-44115.
• Deploy the Sigma rule Detect Suspicious Heredoc Usage to identify potential exploitation attempts.
• Monitor webserver logs for suspicious activity related to OpenClaw, and review any unusual commands being executed on the system.