Alicexbt

**Name of the Vulnerable Software and Affected Versions** Samourai Wallet Stonewallx2 version 0.99.98e **Description** The issue allows a denial of service via a P2P coinjoin. The attacker and victim must follow each other's paynym. Then, the victim must try to collaborate with the attacker for a Stonewallx2 transaction. Next, the attacker broadcasts a tx, spending the inputs used in Stonewallx2 before the victim can broadcast the collaborative transaction. The attacker does not signal opt in RBF, and uses the lowest fee rate. This would result in the victim being unable to perform Stonewallx2. The attacker could use multiple paynyms. **Recommendations** As a temporary workaround, consider disabling the Stonewallx2 feature until a patch is available. Restrict access to P2P coinjoin transactions to minimize the risk of exploitation. Avoid collaborating with untrusted paynyms for Stonewallx2 transactions.