Electrum Releases 4.8.4 Security Update to Fix Lightning Network Onion Message Vulnerability

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On November 6, the Bitcoin wallet Electrum released version 4.8.4 to address a vulnerability related to a network upgrade in the Lightning Network. The update prevents malformed onion messages from causing disconnections with channel peers. Electrum now discards all incoming onion messages until practical use cases are implemented. The patch also resolves issues with mnemonic recovery from older versions. Electrum 4.8.3, released in late October, fixed a security vulnerability that was actively being exploited in the wild.

Huo Xing Finance reports that the Bitcoin wallet Electrum announced on X the release of version 4.8.4, describing it as another security update. According to the GitHub changelog, this version was released on November 6 and addresses a vulnerability related to Lightning Network onion messages: malformed onion messages from arbitrary sources could cause Electrum to disconnect from its channel peers. Electrum will currently discard all incoming onion messages until a practical implementation is achieved. Additionally, the new version fixes issues such as failures to restore certain mnemonic phrases from versions prior to v2. Electrum’s previous version, 4.8.3, was released in late October and patched a critical vulnerability that had already been exploited in the wild.

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