Introducing deepsec: The security harness for finding vulnerabilities in your codebase (opens in new tab)

**Published:** May 4, 2026 | **Authors:** Malte Ubl --- Today we’re open sourcing `deepsec`: a security harness powered by coding agents. It runs on your own infrastructure and surfaces hard-to-find issues in large codebases. You can run `deepsec` on your laptop without setting up a cloud service for privileged source code access. For inference, you can use your existing Claude or Codex subscription without any additional setup. Scanning large repos can take multiple days on a single mach...