Security & Threat Intelligence · 25.07.2026, 15:30 UTC
Inside the breach that broke the internet: The untold story of Log4Shell
| Schweregrad | medium |
|---|---|
| CVSS | 4.0 |
| Kategorie | Security & Threat Intelligence |
| Quelle | GitHub Security Advisories ↗ |
| Veröffentlicht | 25.07.2026 UTC |
Sicherheitsmeldung mit Schweregrad mittel (CVSS 4.0). Technische Details im Tab „Originaltext“; empfohlene Schritte in der Checkliste.
When Christian Grobmeier went to help his son with a Minecraft problem, he found the game displaying a warning: “We are suffering from a security hole from Log4J, please be careful and update immediately.”
I stared at the screen and told my son, ‘I’m sorry, it’s my fault.’ Christian Grobmeier, Log4j maintainer
This is the untold story of how one maintainer and the Log4j team navigated a crisis that exposed critical gaps in our digital infrastructure and demonstrated the importance of open source security and sustainability. Now, initiatives like the GitHub Secure Open Source Fund are working to make sure it never happens again.
It all started a few hours earlier on a cold November day, when Christian, who is a maintainer of the open source project Log4j, planned to spend time playing games with his son. Instead, he found himself staring at his phone, watching notifications pile up in his inbox—10, then 20 emails flooding in. When he saw the words “remote code execution,” his first thought was: “Maybe I’m on the wrong mailing list.”
He wasn’t. And within hours, Christian would be at the center of what became known as Log4Shell: the most severe vulnerability in internet history, affecting billions of devices from Fortune 500 companies to Minecraft servers worldwide.
“I told my son, I will play with you in like five minutes,” Christian recalls. “But he didn’t see me for the next couple of days.”
Watch the full interview with Christian Grobmeier and Gregg Cochran, staff program manager at GitHub, above. 👆
The ubiquity that made Log4Shell a perfect storm
Log4j is …