Bitcoin Core Discloses High-Severity Security Bug That Could Halt Mining Nodes

Bitcoin Core disclosed three security vulnerabilities on Nov. 10, 2026, including a high-severity defect capable of disrupting mining operations and two additional weaknesses affecting block processing and Tor connections. Although developers patched the problems in October 2025, their technical details remained confidential until now. The most consequential vulnerability, identified as CVE-2025-62861 , affected Bitcoin Core versions 28.0 through 28.2 and 29.0 through 29.1. Classified as high severity, the defect involved transaction handling during blockchain reorganizations , potentially leaving mining nodes unable to construct valid block templates. At its center were version 3 transactions, commonly called TRUC transactions, which operate under specialized mempool restrictions. During a chain reorganization, Bitcoin Core could incorrectly evict transactions while retaining dependent transactions, creating inconsistencies within its transaction pool. For miners, the consequences were particularly troublesome.

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