According to Foresight News, the Bitcoin Core project disclosed a Bitcoin network security vulnerability caused by a memory DoS leak due to spam headers, and said that the problem is of high severity. Before Bitcoin Core v24.0.1, attackers could use low-difficulty header chains to send spam to nodes, which was used to remotely cause peer nodes to crash. Bitcoin Core has implemented protection against this DoS, that is, the node will first verify whether the presented chain has enough work before committing to store it. As a result, Bitcoin Core no longer relies on checkpoints to prevent any known attacks.

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