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An AI defense system for cyber attack | YC S26

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Introducing nginx-poolslip, a fresh RCE for the the latest nginx release 1.31.0. nginx-rift has been patched, but our security agent Vega has found a new 0 day. We will release the full technical writeup with ASLR bypass 30 days after the patch on

Introducing nginx-poolslip, a fresh RCE for the the latest nginx release 1.31.0. nginx-rift has been patched, but our security agent Vega has found a new 0 day. We will release the full technical writeup with ASLR bypass 30 days after the patch on

487,308 views

GhostLock (CVE-2026-43499) is a 15yr old kernel 0-day we used in IonStack full chain exploit. Everything around you, as long as it runs Linux, from IoT to mobile to desktop, is affected. Read how we won $92,337 bug bounty with GhostLock and see our exploit on Github. Link below

GhostLock (CVE-2026-43499) is a 15yr old kernel 0-day we used in IonStack full chain exploit. Everything around you, as long as it runs Linux, from IoT to mobile to desktop, is affected. Read how we won $92,337 bug bounty with GhostLock and see our exploit on Github. Link below

149,089 views

Since V8 had heap sandbox, Chrome renderer RCE usually means chaining 2 bugs Today we bring the Spear of Longinus 1 bug, 100% success, no heap spray, found in 40+ major versions, arbitrary renderer read/write + V8 sandbox escape Our CVE-2026-6307 writeup

Since V8 had heap sandbox, Chrome renderer RCE usually means chaining 2 bugs Today we bring the Spear of Longinus 1 bug, 100% success, no heap spray, found in 40+ major versions, arbitrary renderer read/write + V8 sandbox escape Our CVE-2026-6307 writeup

51,073 views

Today’s exploit is from a ipv6 UAF, introduced in Nov 2021, fixed on upstream in Aug 2026. Discovered and exploit by NebuSec security pipeline. Exploit in our GitHub:

Today’s exploit is from a ipv6 UAF, introduced in Nov 2021, fixed on upstream in Aug 2026. Discovered and exploit by NebuSec security pipeline. Exploit in our GitHub:

15,667 views

Today's exploit is for the latest Fedora 44, a UAF in netfilter, CVE-2026-52912. It was introduced in Mar 2016 and fixed upstream in May 2026. Discovered and exploited by the NebuSec security pipeline. (RANDOM_KMALLOC_CACHES + SELinux) Exp source code:

Today's exploit is for the latest Fedora 44, a UAF in netfilter, CVE-2026-52912. It was introduced in Mar 2016 and fixed upstream in May 2026. Discovered and exploited by the NebuSec security pipeline. (RANDOM_KMALLOC_CACHES + SELinux) Exp source code:

12,030 views

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Proxmox VE 7.x authentication bypass (pre-auth RCE)

Proxmox VE 7.x authentication bypass (pre-auth RCE)

222,248 views • 7 days ago

Nebula Security is now backed by Y Combinator. We’re celebrating by bringing you the world’s first Android 17 root demo — “IonStack”, a url click can let attacker fully control your phone. This is not only an Android root demo. We’re bringing you a full chain browser-to-kernel exploit with two 0-day vulnerabilities affecting Firefox before v151.0.2 and all Linux distros in 15 years. "IonStack" demonstrates how bad actors can control your phone by sending a malicious URL, but good news, Nebula Security found it before attackers do. Both 0-day were found by our code scanning agent, VEGA, overshadowing any vulnerabilities found by Mythos or any scanner you name it. VEGA has demonstrated its extraordinary capability in finding critical bugs in the world’s most complicated software: operating systems and browsers. It can spot the same vulnerabilities in your codebase too. VEGA support full scan and incremental scan that can integrated into your CI/CD flow. We launched VEGA within YC companies and received overwhelmingly positive feedback. Now it is open to all enterprise customers in private beta. Book a demo with us:

Nebula Security is now backed by Y Combinator. We’re celebrating by bringing you the world’s first Android 17 root demo — “IonStack”, a url click can let attacker fully control your phone. This is not only an Android root demo. We’re bringing you a full chain browser-to-kernel exploit with two 0-day vulnerabilities affecting Firefox before v151.0.2 and all Linux distros in 15 years. "IonStack" demonstrates how bad actors can control your phone by sending a malicious URL, but good news, Nebula Security found it before attackers do. Both 0-day were found by our code scanning agent, VEGA, overshadowing any vulnerabilities found by Mythos or any scanner you name it. VEGA has demonstrated its extraordinary capability in finding critical bugs in the world’s most complicated software: operating systems and browsers. It can spot the same vulnerabilities in your codebase too. VEGA support full scan and incremental scan that can integrated into your CI/CD flow. We launched VEGA within YC companies and received overwhelmingly positive feedback. Now it is open to all enterprise customers in private beta. Book a demo with us:

225,352 views • 2 months ago

Watch us open the camera and uncover the anonymous identity behind Tor browser: We published the writeup for the browser RCE in IonStack. Mythos reported 271 bugs in Firefox 150 but still missed this one. And the Tor Browser is also affected by CVE-2026-10702. Update your Tor!

Watch us open the camera and uncover the anonymous identity behind Tor browser: We published the writeup for the browser RCE in IonStack. Mythos reported 271 bugs in Firefox 150 but still missed this one. And the Tor Browser is also affected by CVE-2026-10702. Update your Tor!

73,584 views • 1 month ago

Here goes nginx-quicburst (CVE-2026-42530), a new RCE in Nginx discovered by our security agent VEGA and demonstrated by Nebula Security. This is only the third NGINX vulnerability since 2014 to receive NGINX’s “major” severity rating. If you use Nginx 1.31 with QUIC enabled, we recommend upgrading to the latest version. This bug has been patched in the latest Nginx release. We will publish the technical writeup, including the ASLR bypass, on July 18 together with the previous nginx-poolslip writeup.

Here goes nginx-quicburst (CVE-2026-42530), a new RCE in Nginx discovered by our security agent VEGA and demonstrated by Nebula Security. This is only the third NGINX vulnerability since 2014 to receive NGINX’s “major” severity rating. If you use Nginx 1.31 with QUIC enabled, we recommend upgrading to the latest version. This bug has been patched in the latest Nginx release. We will publish the technical writeup, including the ASLR bypass, on July 18 together with the previous nginx-poolslip writeup.

106,081 views • 2 months ago

When the attackers have AI, how do you prevent the next HuggingFace incident from happening to your product? Today, we launch VEGA with Y Combinator , a beyond Mythos level cybersecurity agent that finds critical vulnerabilities before your product ships. VEGA reviews your source code, identifies vulnerabilities before release, monitors infrastructure and supply-chain risks, investigates attack paths, and fixes issues before attackers find them. AI makes you fast. VEGA makes you secure. Learn more at

When the attackers have AI, how do you prevent the next HuggingFace incident from happening to your product? Today, we launch VEGA with Y Combinator , a beyond Mythos level cybersecurity agent that finds critical vulnerabilities before your product ships. VEGA reviews your source code, identifies vulnerabilities before release, monitors infrastructure and supply-chain risks, investigates attack paths, and fixes issues before attackers find them. AI makes you fast. VEGA makes you secure. Learn more at

36,022 views • 1 month ago

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