---
id: 1243
title: "GPT-5.5-Cyber built a zlib fuzzing lab in a day"
source_domain: blog.trailofbits.com
source_url: "https://blog.trailofbits.com/2026/07/02/field-reports-from-patch-the-planet/"
published_at: "2026-07-02 11:00"
tags: ["ai-security", "open-source", "fuzzing", "vulnerability-discovery", "trail-of-bits", "gpt-5-5-cyber", "zlib"]
phying_url: "https://phying.com/item/1243"
lang: en
---

# GPT-5.5-Cyber built a zlib fuzzing lab in a day

## Summary

A Patch the Planet field report: GPT-5.5-Cyber built a bespoke zlib fuzzing campaign in a single day, work that once took skilled researchers weeks.

## Intelligence Metadata

- **Sources:** blog.trailofbits.com
- **Published:** 2026-07-02 11:00
- **Original:** https://blog.trailofbits.com/2026/07/02/field-reports-from-patch-the-planet/
- **Phying News:** https://phying.com/item/1243