NebuSec

Autonomous AI defense system for cyber attack

2.5Score#504 of 999 agents#3 of 8 in Application security engineer

Why it ranks #504

NebuSec, an AI application security engineer from YC S26, ranks #504 of 999 AI agents and #3 of 8 in Application security engineer, with a score of 2.5 of 10. Data as of 3 Oct 2026.

The score adds four parts, each 0 to 10, by weight. Every point comes from public evidence. How scoring works ·

Proof 0 × 30% 0.0
Scale 2 × 30% 0.6
Momentum 4 × 25% 1.0
Autonomy 6 × 15% 0.9
= 2.5

Proof
Do customers use it? 30% of the score
0
No public claims of customers or revenue yet.
Not found: revenue or growth (+4), named customers (+3), a customer result (+2), a customer count (+2), work done at scale (+2)
Scale
Is there a real company behind it? 30% of the score
2
4 people.
- +2
  4 people on its YC page3 or 4 people
Not found: funding round in its news (+3)
Momentum
Is it shipping and growing now? 25% of the score
4
Shows a recent launch and a new batch.
- +3
  Launched in the last 6 monthsNebula Security: Bringing beyond Mythos protection to your productLaunch YC post · 23 Jul 2026
- +1
  New: YC Summer 2026
Not found: open roles on YC (+2), new traction claim in the last 6 months (+2), funding news in the last year (+2)
Autonomy
How much of the job does it do on its own? 15% of the score
6
Supervised agent: takes actions in other systems; a person approves key steps.
- +6
  Level 2 of 4: Supervised agentTakes actions in other systems; a person approves key steps.
What the model read
- Acts in other systems: 58% likely
- Finishes whole tasks: 27% likely
- Calls itself an agent: 80% likely
Level 2: Takes actions in other systems; a person approves key steps.

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.