Startupsby GlyphWhy it ranks
How the rank works- went through YCProgram · this site+4
- team of 2Team size · YC's directory+2.5
A sum of public facts, not a judgement and not investment advice.
Also from F26 in AI
All of F26Founders
- Doruk Tan OzturkFounder
- Fabian ZbindenFounder
About 0.security
0.security builds an autonomous offensive security team that finds and fixes vulnerabilities as fast as AI writes code and before attackers exploit them. We've found and fixed dozens of previously unknown vulnerabilities (0-days) in government software across multiple countries and in software running on 3+ billion devices. Today we work with EY (Ernst & Young), leading tech companies and defense organizations. Our AI agents hack into any software, verify every vulnerability they find, and ship the fix. They run 24/7 across the full stack, from web apps and dependencies down to operating systems and the Linux kernel. We offer two products: 0cloud, where developer teams connect their repos and get security handled 24/7 at the speed of their coding agents, and our open-source harness, which we deploy & run for tech companies, enterprises and critical infrastructure providers.
- YC batch
- F26 · Fall 2026
- Status, per YC
- Active
- Category
- AI, Developer tools
- Team size
- 2
- Location
- San Francisco, CA, USA
- Founded
- 2026
- Checked
- 6h ago
YC tags: B2B, Open Source, Cybersecurity, Enterprise, Defense
Changes seen
Joined Y Combinator's Fall 2026 batch (F26).
0.security: questions
Which YC batch was 0.security in?
0.security was in Y Combinator's Fall 2026 batch (F26).
Is 0.security still active?
Y Combinator lists 0.security as active.
Who founded 0.security?
0.security's founders, as listed on its YC page: Doruk Tan Ozturk (Founder), Fabian Zbinden (Founder).
Where is 0.security based?
0.security lists San Francisco, CA, USA as its location on YC's directory.