Electrum: Malicious server can replace a just-broadcast tx and try to trick user into RBF-ing it

影響: pip:electrum < 4.8.3 → 4.8.3

The main Electrum server the client connects to is trusted with mempool ("unconfirmed") transactions. This is documented [design](https://electrum.readthedocs.io/en/latest/faq.html#does-electrum-trust-servers). [0] However now someone figured out a way to practically exploit it: - when the client broadcasts a new tx1, a malicious server can swallow it, - and update the client's history with a conflicting (invalid) tx2 that replaces the outputs with the attacker's output address. - Tx2 has inval…

在 GitHub Advisory Database 阅读

2026/10/29 06:23，GitHub Advisory Database 发布了“Electrum: Malicious server can replace a just-broadcast tx and try to trick user into RBF-ing it”（类型：漏洞公告）。严重程度为“严重”（critical）。相关技术：Python。CVE：CVE-2026-117601。