Bitcoin Core developers disclosed three security flaws in software that runs most of the network’s nodes. All had been fixed before the advisories were released. The flaws involved service disruption or privacy, not coin theft or forgery; none was rated critical, and the developers reported no evidence of exploitation.
The most serious flaw could corrupt a node’s mempool during a chain reorganization, preventing it from building mining block templates until restarted. Another could let a peer stall block processing, while the third wrongly gave some Tor connections permissions that removed service-disruption and privacy protections.
