[1] https://www.smh.com.au/technology/heartbleed-disclosure-timeline-who-knew-what-and-when-20140414-zqurk.html
True. the amazing part of your first reference about heartbleed vulnerability is this quote that asks for more information for understanding what may have occurred before discovering the vulnerability:
anyways this exploit reminds me the principles of protecting from supply chain attacks by NIST [1][2] and now the question is how much the software supply chain in bitcoin follows it? (in other words, does this exploit fit in the concept of supply chain attack?)
[1] https://csrc.nist.gov/csrc/media/projects/supply-chain-risk-management/documents/ssca/2017-winter/ncsc_placemat.pdf
[2] mirror of [1]: http://www.mixoftix.net/knowledge_base/security/nist_suppy_chain_attack_.pdf