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. If it goes down, no balance disappears: the keys sit in the wallet, not in the node. What is lost is your own verification, and with two of the three bugs the machine goes down with it.
Three advisories in one day: what Bitcoin Core disclosed
The three publications stand together in the project's advisory list. Two of them are rated “Medium”, one “Low”, and all three carry the note “easily discoverable”. That is the decisive rating: anyone reading the code finds the spot without particular effort.
- TCP urgent data: a peer can crash a node on Windows, macOS or BSD. Linux is not affected.
- Pau...
English (US)