Carbon monoxide does not react with water to form an acid.

The carbon monoxide molecule is one that won't react with water at all. As the acidic oxide has a higher oxidation state, it reacts with water to produce acid, and reacts with base to produce salt. 

${\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{H}}_2{\mathrm{CO}}_3$

$\mathrm{C}+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{steam}\right)\to \mathrm{CO}+{\mathrm{H}}_2$

$\left.\begin{array}{l}{\mathrm{CH}}_4+{\mathrm{H}}_2\mathrm{O}\to \mathrm{CO}+3{\mathrm{H}}_2\\ {\mathrm{C}}_3{\mathrm{H}}_8+{\mathrm{H}}_2\mathrm{O}\to 3\mathrm{CO}+{\mathrm{H}}_2\end{array}\right]$ both reactions are carried out at $1270 \mathrm{K}$ temp. with $\mathrm{Ni}$ catalyst