# Vercel — Introducing deepsec: The security harness for finding vulnerabilities in your codebase

- Company: Vercel (vercel.com)
- Announced: 2026-05-04T04:00:00+00:00
- Category: developer-tool-release
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://vercel.com/blog/introducing-deepsec-find-and-fix-vulnerabilities-in-your-code-base
- Record: https://forck.live/items/20713-introducing-deepsec-the-security-harness-for-finding-vulnerabilities-in-your
- Subject: v0 / AI SDK / AI Gateway

Vercel open-sourced deepsec, a security harness that uses coding agents (Claude and Codex) to find vulnerabilities in large codebases. It runs on a user's own infrastructure, supports optional parallel execution via Vercel Sandboxes, and includes a plugin system for custom scanners. The tool has been tested internally and on customer codebases, with a reported false positive rate of roughly 10-20%.

## Evidence

Verbatim from https://vercel.com/blog/introducing-deepsec-find-and-fix-vulnerabilities-in-your-code-base:

> 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.

---

Record: https://forck.live/items/20713-introducing-deepsec-the-security-harness-for-finding-vulnerabilities-in-your
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md