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Hello world. This is the site of Antonio Cheong.

You may know me from:

• Bug bounties, including CVE-2022-26726, a MacOS/IOS privilege escalation exploit for TCC.
• One-click Stable Diffusion on Google Colab from October 2022
• CopilotChat.nvim for which I was the original author from 2023.
• Research on Apple Location Services from May 2024 and analytics during my internship at the University of Cambridge August 2025.
• Various reverse engineering efforts around ChatGPT, Sydney, and Google Bard around 2022-2023 before any APIs were available where my libraries gained over 1M downloads and 40k+ stars total.
• An API compatible implementation of Obsidian Sync during the summer of 2023 derived purely from blindly reverse engineering the client.
• Hackathons I've been to such as Huawei Tech Arena 2024 or Hackeurope (Ireland).
• Around Cardiff, where I studied & play badminton.

I am currently working on a startup in securing the open-source supply chain. More details to be released soon :)

Bored? Check out my blog or photo gallery!

Contact

• Email: Expect a response in 2-3 business days.
• Matrix: I prefer email, but you can call me over Matrix.

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Timezone: UTC

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