Lightning network is vulnerable.

Mat Corallo claims that the solutions proposed by Antoine Riard —mempool scanning (temporary memory for unconfirmed transactions) and transaction resignation and retransmission— are ineffective.

He argues that mempool scanning could be ineffective if an attacker quickly connects to the local Lightning node, and that transaction resignation and retransmission could be circumvented by an attacker with a large amount of processing power.

https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-October/022015.html