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On Dec 21st, we performed an ad hoc upgrade to our mainnet program that introduced a critical vulnerability that was quickly discovered and fixed within 24 hours. There was no attempt to exploit it and no loss of funds.The bug was identified by a user on Discord (jayne) who had been reviewing the program code, who privately messaged one of our core devs with details about the issue. After we acknowledged the problem, the mainnet program was redeployed with the problematic feature disabled. The f...