I am making a crockpot beef recipe that calls for a lot of red wine. I usually have an opened bottle around that I keep just for this purpose. I didn't have enough in my open bottle and had to use about half a cup from another already open bottle that I must have forgotten about.
When I looked again, I remembered that this second open bottle had been open a really, really long time. Like many months!

It smelled okay to me.
Is there any safety risk in using really old wine, or I am mainly risking that the wine may have tasted a bit vinegar-y?
Thanks from a CLBBer who should really dust that liquor cabinet more often.