Bitcoin Core team reveals 3 key vulnerabilities, mining flaw patched in v28.3

Bitcoin Core developers have identified and disclosed three significant security vulnerabilities affecting the popular open-source software that underpins much of the Bitcoin network. The most serious flaw, classified as high-severity, threatened the mining operations on the blockchain and could potentially have prevented miners from generating new blocks, thereby endangering network continuity. According to security advisories published on November 10, the critical vulnerability, tagged as CVE-2025-62861, had the potential to disrupt mining activities following a blockchain reorganization. During such an event, previously validated blocks can be replaced by an alternative chain, a mechanism designed to keep the chain secure but susceptible to rare edge-case bugs. The flaw could have led to an inconsistent state within a node’s mempool, which holds all unconfirmed transactions waiting to be included in a new block.

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