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ATR-2026-00111criticalPrivilege Escalationexperimental

Shell Metacharacter Injection in Tool Arguments

Detects shell metacharacter injection patterns in tool arguments or agent-generated commands. Attackers embed backtick execution, $() subshells, semicolons, pipes, or logical operators to chain malicious commands onto otherwise safe tool invocations. Null byte and newline injection are also covered as they can truncate or split commands in vulnerable parsers.

Severity
critical
Category
Privilege Escalation
Scan Target
mcp
Author
ATR Community

Response Actions

block toolalertsnapshot

References

OWASP Agentic
ASI05:2026 - Unexpected Code Execution