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Re:Operation Rosehub – patching thousands of open-source pro... by edutechnion on Wednesday March 01, 2017 @07:15PM (#13770116)
They were PRs that required approval and merge from the Github project maintainers. Here is a search to see some of their work:

https://github.com/search?q=%22Upgrade+Apache+Commons+Collec...

Re:Operation Rosehub – patching thousands of open-source pro... by fudged71 on Wednesday March 01, 2017 @08:44PM (#13770669)
It's actually incredibly interesting to read how the developers individually responded to each of these PRs.

It would have been great to see a count of how many PRs have been accepted.

Re:Operation Rosehub – patching thousands of open-source pro... by cpeterso on Wednesday March 01, 2017 @09:38PM (#13770956)
edutechnion's link says 1108 open PRs and 999 closed.

Interesting that 2100 of the PRs are "Upgrade Apache Commons Collections to v3.2.2" and just 7 were "Upgrade Apache Commons Collections to v4.1".

Re:Operation Rosehub – patching thousands of open-source pro... by therealdrag0 on Thursday March 02, 2017 @02:02PM (#13777105)
Probably v3.2.2 was lower hanging fruit for most projects. Instead of having to make code changes.