Bitcoin Core Discloses Three Previously Patched Security Vulnerabilities Affecting Mining Nodes

Bitcoin Core maintainers have publicly disclosed three previously patched security vulnerabilities, including a high-severity flaw that disrupted mining operations. The high-severity issue, CVE-2025-62861, affected versions 28.0 to 28.2 and 29.0 to 29.1, triggering mempool inconsistencies after chain reorganizations that required node restarts to resume generating valid block templates. Maintainers also disclosed two medium-severity flaws: CVE-2025-62859, which allowed peers to delay compact block processing by up to 10 minutes, and CVE-2025-62860, which caused unintended Tor whitelisting. All issues were fixed in October 2025 via versions 30.0 and 29.2, posing no immediate threat.