The Warning Sign That Your Canned Coconut Milk Has Gone Bad - Tasting Table
Briefly

Buying canned coconut milk is a great way to keep this staple on hand for quick meals, but once opened, it shouldn't sit too long.
The best way to determine if your coconut milk is still good is to do a sniff test; sour or musty smells are signs of spoilage.
Canned coconut milk can be safe for consumption for two to five years unopened, but its best quality lasts only 18-24 months.
After opening, leftovers should be stored in the refrigerator and should not be left in the tin for too long to avoid off-flavors.
Read at Tasting Table
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