# Bitcoin Core Flaw Can Halt Block Template Creation After Reorganization

By Simon Yoon

Canonical URL: https://www.tokenpost.com/news/technology/54566
Published: 2026-11-11T22:26:41.000Z
Updated: 2026-11-11T22:26:41.000Z
Section: Technology

> The flaw affects Bitcoin Core 28.0 through 28.2 and 29.0 through 29.1. Fixed releases appeared in October 2025, more than a year before the details became public.

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.