Provide references for CVE-2018-18920.
Where can I find more information about CVE-2018-18920?
References are available at: https://twitter.com/AlexanderFisher/status/1060923428641878019, https://github.com/ethereum/py-evm/issues/1448, https://twitter.com/NettaLab/status/1060889400102383617, https://www.reddit.com/r/ethereum/comments/9vkk2g/netta_labs_claim_to_have_found_a_vulnerability_in/e9d3wyx/.