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NebuSec

YC S26

Vancouver, US · Founded 2026 · 4 employees · 17 known investors

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Nebula Security uses AI-driven security pipelines to accelerate vulnerability research in widely used software such as operating systems, browsers, and applications. The company identifies security bugs and vulnerabilities significantly faster than traditional manual research methods.

Also known as Nebula Security Corp. · Nebula Security

AI & Machine LearningCybersecurityEnterprise SoftwareArtificial IntelligenceB2BSecurityEnterpriseUnited States of AmericaAmerica / CanadaFully Remote

Founders & leadership· Y Combinator alumni (S26)

NebuSec was founded in 2026 by Eten Zou, Yuan Tan, Frank Wu, and Xiaochuan Yu.

EZEten Zou
Eten ZouCEO & CofounderEten Zou holds a PhD in Cybersecurity and is the founder and CEO of Nebula Security, which focuses on automated vulnerability research.
YTYuan Tan
Yuan TanCTOYuan Tan is the founder of Nebula Security, a YC-backed company. He has a background in systems security research, including DARPA-funded work on program analysis, and has presented at Black Hat USA.
FWFrank Wu
Frank WuCo-FounderFrank Wu founded Nebula Security and has spoken at security conferences including Black Hat USA. He previously led automated program repair research at DARPA and has developed exploit chains across Chrome, Firefox, Linux, and Android. He holds a Ph.D. in progress.
XYXiaochuan Yu
Xiaochuan YuCo-FounderXiaochuan Yu founded Nebula Security and previously participated in competitive hacking, including DEFCON competitions and CTF events. They hold an M.S. from UC San Diego and have published security research at USENIX Security and BlackHat.

Investors · 17

Vela Partnerslisted by Vela PartnersSan Francisco · $100K – $500K
Y Combinatorlisted by Y CombinatorSan Francisco · $500K

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Zero Indexlisted by Zero Index

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2468 Venturesreported

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Aera VCreportedSingapore · $25K – $5M

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Angel Operator Partners (aop)reportedChicago

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C Square Capitalreported

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CCL Investments SaRLreported

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Depth VenturesreportedSan Francisco

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Eight CapitalreportedNorwalk

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G Vision CapitalreportedMountain View

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Hydrocarbon Minerals 4reported

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JsquarereportedSingapore

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Maiora Rebel Venturesreported

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Manresa VenturesreportedSan Francisco · $500K – $3M

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Team IgnitereportedFolsom · $15M

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Related companies · 8

Palo Alto NetworksPalo Alto Networks provides cybersecurity platforms and services to protect organizations' digital infrastructure across cloud, network, and security operations. The company serves enterprise organizations, governments, financial institutions, utilities, and healthcare providers globally.
TraceforceTraceforce is an on-device security platform that monitors and controls AI applications, desktop apps, CLI agents, and MCP (Model Context Protocol) connectors across an organization's device fleet, tracking tool calls and blocking dangerous actions in real time. It offers device inventory, incident intelligence, automated remediation, and integrates with MDM tools like Jamf, JumpCloud, and NinjaOne for enterprise IT teams.
ZeropathZeroPath provides an application security platform that consolidates findings from multiple security scanning tools (SAST, SCA, IaC, secrets detection) into a unified dashboard with AI-driven risk scoring and prioritization for enterprise security teams.
LogosGuardLogosGuard is a browser extension that automatically redacts sensitive data before prompts are sent to AI tools like ChatGPT and Claude. The tool detects and replaces personal information with placeholders before submission, ensuring users can safely leverage AI without accidentally leaking private data.
HuntressHuntress provides enterprise-grade cybersecurity solutions designed for businesses of all sizes, focusing on threat detection and response to protect organizations against hackers.
XeolXEOL provides dataset and tools to identify abandoned and end-of-life open source packages that standard vulnerability scanners miss, helping companies manage risks in their software dependencies.
Gecko SecurityGecko is a code security platform that uses AI to analyze codebases, infrastructure, and logic to detect exploitable vulnerabilities and provide developer fixes. It targets enterprise and startup development teams seeking to find complex, multi-step attack chains and business logic flaws in their code and microservices.
LumifiLumifi provides cybersecurity consulting and managed security services, including security operations center support and executive briefing services for organizations seeking to address their cyber threats and security challenges.

Companies working in the same space as NebuSec.

Legal entities · 1

corporate structure
Nebula Security Corp.

In the news

Nebula Security: Bringing beyond Mythos protection to your productycombinator.com · Jul 2026

Frequently asked questions

What does NebuSec do?
Nebula Security uses AI-driven security pipelines to accelerate vulnerability research in widely used software such as operating systems, browsers, and applications. The company identifies security bugs and vulnerabilities significantly faster than traditional manual research methods.
Who founded NebuSec?
NebuSec was founded by Eten Zou, Yuan Tan, Frank Wu, Xiaochuan Yu in 2026.
Who are NebuSec's investors?
NebuSec's investors include Redbud Trail Group, Vela Partners, Y Combinator, Zero Index, 2468 Ventures, Aera VC, Angel Operator Partners (aop), C Square Capital and 9 more.
Where is NebuSec headquartered?
NebuSec is headquartered in Vancouver, US.