Most open source licenses already include that in a "no warranty" clause that is supposed to cover this. I don't know anything about law, but it looks like in

Most open source licenses already include that in a "no warranty" clause that is supposed to cover this. I don't know anything about law, but it looks like in jurisdictions where this clause doesn't apply, signing a separate contract wouldn't help either: https://law.stackexchange.com/questions/1410/do-warranty-disclaimers-in-software-licenses-carry-any-legal-weight https://law.stackexchange.com/questions/1410/do-warranty-dis...