YCS26· AINebuSec
Autonomous AI defense system for cyber attack
Founders
- Eten ZouFounder/CEO
- Yuan TanFounder/CTO
- Frank WuFounder/COO
- Xiaochuan YuFounder/VP of Vulnerability Research
Same space
Competitors
Closest in what they build, same category.
TridentS26Autonomous offensive security agents. The best defense is offenseShared: security, cybersecurityActive
PromptArmorW24LLM Security and ComplianceShared: security, cybersecurityActive
XeolS23Close your outdated dependency attack vectorShared: security, cybersecurityAcquired
Sublime BlackW19Automating Cyber Security Incident Response Through Artificial…Shared: cybersecurityInactive
CodeAnt AIW24Autonomous offensive and defensive cybersecurity platformShared: cybersecurityActive
Adjacent
Overlapping tags, a different niche.
TelivyS21Automate your cyber security risk assessmentsShared: security, cybersecurityAcquired
Veria LabsF25Continuous AI pentesting that finds and fixes vulnerabilitiesShared: security, cybersecurityActive
Gecko SecurityF24The AI Security Engineer to Find and Fix VulnerabilitiesShared: security, cybersecurityActive
ZeroPathS24Automatically find and fix your software vulnerabilitiesShared: security, cybersecurityActive
- FuzzbuzzW19Fuzzing as a ServiceShared: security, cybersecurityAcquired
Also from S26 in AI
Batchmates in Summer 2026.
TraceforceS26CrowdStrike for AI AgentsActive
CautionS26Hosting platform for software you can't afford to have hackedActive
ConiferS26Least cost routing system to reduce 70%+ token spendActive
DecaworkS26Training company-specific models that approve AI actions.Active
FabraixS26The world's frontier hacker of AI agents.Active
PalisadeS26AI that finds and fixes OS-level vulnerabilities across device fleetsActive
About NebuSec
NebuSec is founded by the world’s #1 hacking team. 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 NebuSec” 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.
San Francisco, CA, USA; Remote
NebuSec: questions
Which YC batch was NebuSec in?
NebuSec was in Y Combinator's Summer 2026 batch (S26).
Is NebuSec still active?
Y Combinator lists NebuSec as active.
Who founded NebuSec?
NebuSec's founders, as listed on its YC page: Eten Zou (Founder/CEO), Yuan Tan (Founder/CTO), Frank Wu (Founder/COO), Xiaochuan Yu (Founder/VP of Vulnerability Research).
Where is NebuSec based?
NebuSec lists San Francisco, CA, USA; Remote as its location on YC's directory.
Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.