New Transaction-Relay Jamming Vulnerability Let Attackers Exploits Bitcoin Nodes

**Transaction-relay jamming vulnerability (Bitcoin / Lightning Network)**: The report explains two transaction-relay throughput attack variants—high overflow and low overflow—that manipulate Bitcoin node transaction-selection and announcement limits to block or delay time-sensitive transactions (notably Lightning justice/timeout transactions), potentially enabling theft or loss of channel funds; proposed mitigations include periodic rebroadcasting, dynamic fee increases, over-provisioning nodes, and protocol-level fixes, and the issue was publicly disclosed in December 2024 and is being tracked by a CVE request, with no observed in-the-wild exploits to date.