the exploit has been out for over 10 hours

According to the PHP Foundation the OOM vulnerability was originally found by the security audit they commissioned back in 2024.

They never fixed it because there was no working exploit at the time and also because all the fixes had important downsides and they went into decision paralysis.

I do believe that two years is plenty of time for someone to figure out a working exploit, especially with AI assists.

Bottom line, the timing of this recent debacle is centered around the moment that the PHP Foundation decided to finally eat crow, not around when the exploit was actually available. The embargo was just for spectacle. PHP circles are already spinning it as "see how important PHP is, how much of the internet runs on it, how it's critical infrastructure".