Three security flaws in Bitcoin Core: what you can do now

Bitcoin Core published three security advisories at once on October 28, 2026. The most serious of them lets a single malicious peer crash any node running on Windows, macOS or BSD. All three points are fixed in versions 29.5, 30.4, 31.2 and 32.1. If you run your own Bitcoin node and have not updated since Monday, you are running a build whose weaknesses have been described publicly since Wednesday. A node is the machine that verifies the entire blockchain itself instead of trusting a provider.