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A security engineer in your team

Nebula Security is an AI-native cybersecurity company founded by world-class hackers. Nebula Security provides Mythos-level cybersecurity reviews and product security auditing, conducted by our state-of-the-art AI agent and world-class hackers themselves, covering everything from code-level vulnerabilities to architectural weak points. We were the first team to build an nginx RCE and the first to root Android 17. Our co-founders include members of the world’s No. 1 CTF team, DEF CON winners, Black Hat speakers, and PhD in cybersecurity. We have won $400K in bug bounties by exploiting the Linux kernel and Chrome browser. “Audited by Nebula Security” is a mark of serious security credibility: a signal to customers, investors, and partners that your product has been reviewed by the world’s best hackers.
Active Founders
Eten Zou
Eten Zou
CEO & Founder
CEO & Founder @ Nebula Security (YC S26). PhD in Cybersecurity. Focus on automated vulnerability research.
Yuan Tan
Yuan Tan
Founder
Founder at Nebula Security (YC S26). Black Hat USA speaker. PhD dropout in System Security with experience in DARPA-funded fundamental research on program analysis.
Frank Wu
Frank Wu
Founder
Founder of Nebula Security (YC S26). Black Hat USA speaker and DEF CON finalist with r3kapig, the world's No. 1 hacking team in 2025. He led the DARPA AIxCC automated program repair team and shipped end-to-end RCE/LPE exploit chains on Chrome, Firefox, Linux, and Android. He pwned Google's kernelCTF multiple times with zero-days, and has published research at top academic venues such as USENIX Security and NDSS. Ph.D. dropout.
Xiaochuan Yu
Xiaochuan Yu
Founder
Founder at Nebula Security (YC S26). Hacked into iPhone, Chrome, Firefox, Safari, QEMU, and various things in your daily life. DEFCON finalist for 3 consecutive years. $200k+ Bug Bounty in Chrome. Core member of r3kapig, the #1 hacking team in the world in 2025, on CTFTime. M.S. from UC San Diego. Research published at USENIX Security, BlackHat. Ph.D. droped out.
Nebula Security
Founded:2026
Batch:Summer 2026
Team Size:4
Status:
Active
Location:Vancouver, WA
Primary Partner:Ankit Gupta