Bitcoin Core Flaw Can Halt Block Template Creation After Reorganization

Bitcoin Core disclosed a vulnerability that can leave affected nodes unable to create block templates after a chain reorganization, with a restart needed before template creation resumes. Identified as CVE-2025-62861, the flaw affects Bitcoin Core versions 28.0 through 28.2 and 29.0 through 29.1. A mempool inconsistency after a reorganization may prevent an affected node from creating templates until it is restarted. Security researcher Niklas Goegge discovered the flaw. Fixed releases were published in October 2025, more than a year before Bitcoin Core made the vulnerability details public Tuesday, Nov. 10, 2026. Simon Yoon reports on blockchain technology for TokenPost. Send corrections or tips to info@tokenpost.com.

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