---
title: "Discussion on \"500 Milliseconds to Midnight: A Builder's Post-Mortem of the XZ Backdoor\" | Hashnode"
description: "Discussion on \"500 Milliseconds to Midnight: A Builder's Post-Mortem of the XZ Backdoor\". One of the most sophisticated supply chain attacks in history was discovered because of a 500-millisecond delay. A half-second lag in an SSH login—a fractional anomaly noticed by a single, curious developer—was the only thing that stood between the s..."
url: "https://hashnode.com/posts/500-milliseconds-to-midnight-a-builders-post-mortem-of-the-xz-backdoor/693b711b652b00d03eef1a14"
---

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Discussion

# [500 Milliseconds to Midnight: A Builder's Post-Mortem of the XZ Backdoor](https://blog.mirrorfolio.com/500-milliseconds-to-midnight-a-builders-post-mortem-of-the-xz-backdoor?utm_source=hashnode&utm_medium=feed)

One of the most sophisticated supply chain attacks in history was discovered because of a 500-millisecond delay. A half-second lag in an SSH login—a fractional anomaly noticed by a single, curious developer—was the only thing that stood between the s...

Dec 12, 2025 · 10 min read · blog.mirrorfolio.com  
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## Written by

[Ahammad kabeer](https://hashnode.com/@KabeerHadi)

@KabeerHadi · Kozhikode, Kerala, India

  
[View profile](https://hashnode.com/@KabeerHadi)

I translate ideas into 0s and 1s

I'm a full-stack engineer from Kerala. Helping startups turn their ideas into digital realities.I specialize in designing and building modern web solutions.

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