Nathan Fretz ☂️

@nmfretz

Software Developer @umbrel

Joined December 2011

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529

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Nathan Fretz ☂️
@nmfretz
Nov 25, 2025
Setting up backups on your @umbrel is a breeze, but I think the real magic is the Rewind feature.
Umbrel ☂️
@umbrel
Nov 22, 2025
Watch @nmfretz nuke his entire Umbrel and restore everything from a backup. Here's the complete step-by-step tutorial on how to: • Set up automatic, encrypted backups • Use the new Rewind feature • Recover from a total disaster Timestamps: 00:00 - Intro 00:28 - Setting up
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Nathan Fretz ☂️
@nmfretz
Aug 28
🚨 The security fix is now available for the Core Lightning app on @umbrel. Update as soon as possible. This updates Core Lightning to v26.06.7 and removes the temporary offline mode, so your node will reconnect to peers and resume Lightning payments and routing.
Core Lightning ⚡️
@Core_LN
Aug 28
Core Lightning 26.06.7 is out and recommended for every node runner. It fixes vulnerabilities reported over the past three weeks, during a sharp rise in AI-generated reports across open source Bitcoin. Details stay under embargo for two weeks, then all published.
Nathan Fretz ☂️
@nmfretz
Aug 27
When fixed binaries drop, attackers can analyze them to identify the vulnerabilities and target unpatched @Core_LN nodes. The app update on @umbrel puts CLN offline. Anyone who installs it is protected if they miss the fixed update at first. We’ll ship the fix as soon as
TheRustyTwit
@rusty_twit
Aug 26
Replying to @callebtc
This is not accurate. The main concern is that LLM analysis of the initial binary release will allow bad actors to exploit. Those concerned, who will be unable to upgrade quickly, should run offline for a while.
Nathan Fretz ☂️
@nmfretz
Aug 27
🚨 A security update is available for the Core Lightning app on @umbrel. Update now. Per @Core_LN guidance, your node stays running and watching Bitcoin, but disconnects from the Lightning Network for now. Core Lightning will publish a signed release with the fix. We’ll ship it
Core Lightning ⚡️
@Core_LN
Aug 26
Core Lightning has been triaging a high volume of AI-generated CVE reports over recent weeks. Several are real, and a coordinated fix is underway. What to do now: do not shut your node down. Restart it with --offline. That flag stops peer connections, so no payments route in,
Nathan Fretz ☂️
@nmfretz
Aug 8
⚠️ A critical vulnerability affecting BTCPay Server versions before 2.4.2 is being actively exploited. If you run BTCPay Server on @umbrel, update immediately, then follow every step in this video to rotate your Lightning Node credentials (also see written instructions in the
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