Bitcoin Core Addresses Three Security Vulnerabilities in October

Bitcoin Core developers have disclosed three security vulnerabilities that could affect the operation of the network. The most serious vulnerability, recorded as CVE-2025-62861, posed a risk that could disrupt Bitcoin miners' ability to produce new blocks under certain conditions. This vulnerability affected versions 28.0 to 28.2 of Bitcoin Core, as well as versions 29.0 and 29.1. Security researcher Niklas Goegge reported the issue on September 26, 2025. Additionally, a medium-level vulnerability coded CVE-2025-62859 allowed malicious network participants to slow down the block processing by altering transaction witness data. In this case, an affected node could be forced to wait up to 10 minutes before processing a block. Another medium-level vulnerability, coded CVE-2025-62860, was related to nodes operating over the Tor network. Developers reported that these vulnerabilities were addressed in October 2025, with fixes included in Bitcoin Core versions 30.0 released on October 10 and 29.2 distributed on October 14.

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