Technically yes, in practice you have 1 or 2 yrs at most.
During this time, most pieces of software, especially specialized ones, will have on average 0-10 people look at it. Out of these, approximately 0.01 will report any issues.
The biggest and most secured OSS projects are corporate backed with many companies having a vested interest in its security, not a medium sized company or random person dumping their code on GH
