Simon Willison • 12/28/2025

Substack Network error = security content they don't allow to be sent

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The article describes the author's troubleshooting of a Substack 'Network error' that prevented sending a newsletter. The error was triggered because the content included a detailed example of a SQL injection exploit against ClickHouse and PostgreSQL. The author discovered, via a Hacker News post, that the string '/etc/hosts' was a known trigger and resolved the issue by removing the exploit code from the newsletter.

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#security #sql injection #Substack
Substack Network error = security content they don't allow to be sent

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