Topic Archive

#Replace-By-Fee

2 Stories Found

Coins•7h ago

Bitcoin Wallet Bug Allowed Rogue Servers to Steal Funds During Transaction Speed-Ups

Key Highlights: Attackers targeted Electrum wallet users by exploiting Bitcoin’s Replace-by-Fee (RBF) feature via malicious Electrum servers. Fraudsters displayed zero-fee or stuck unconfirmed transactions with vanity addresses matching the legitimate destination’s last four characters, tricking users into signing replacements that routed funds to the attacker. Electrum developers released version 4.8.3 on October 24 to introduce ...

4 min readRead

Coins•Oct 24, 2026

Electrum Wallet Attack Masks Bitcoin Theft Behind Transaction Fee Increases

Key Highlights: Electrum has released version 4.8.3 to patch a severe transaction substitution vulnerability that allowed malicious servers to trick users into signing away funds. Attackers exploited Replace-By-Fee (RBF) workflows using vanity addresses matching the final four characters of legitimate destinations to obscure fraudulent transactions. Following private vulnerability reports on October 11 and October 18—the ...

5 min readRead