This Is Why Some Bitcoin Core Nodes Can Stop Building Blocks

Bitcoin Core has published a high-severity advisory disclosing a bug that could prevent affected nodes from creating block templates after a blockchain reorganization. While the flaw didn’t change Bitcoin’s consensus rules, it could leave a miner unable to produce blocks until the node was restarted. How a Reorg Can Leave the Mempool Broken The advisory, CVE-2025-62861, is about an inconsistency involving version 3 transactions, known as TRUC, and Bitcoin Core’s mempool, with the affected releases being versions 28.0 to 28.2 and 29.0 to 29.1. Under BIP-431, TRUC transactions face extra mempool restrictions where each can only have one unconfirmed ancestor (earlier transactions) and one unconfirmed descendant (later transactions).

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