
Security, software correctness, and Rust 🦀 Doing the cyberz @OpenAI prev: @RobinhoodApp, Cruise, @zellic_io, @Dropbox My awful opinions are my own
San Francisco, CA
Joined November 2013
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I'm excited to announce I'm joining @OpenAI!
I left Robinhood in March of 2025 to embark on a wonderful year and a half long career break. I used that time to: travel (I went drifting in japan!); build a low-latency arbitrage bot on Solana, briefly becoming the 60th most profitable arbitrage bot on the chain; and learning @leanprover in service of building an accurate model of rust to prove `unsafe` rust code was free of UB!
But a lot has changed. For one, most engineers I knew were, at the time, leveraging Github Copilot as an "intelligent autocomplete" to accelerate parts of writing code. Software was (and at many places, still is) manually reviewed, and there was much doubt, especially from myself, that models could ever improve to the point to economically handle the more complex tasks of implementing entire features, proving conjectures, or discovering, and exploiting, novel 0-day vulnerabilities.
Clearly I was wrong! I've been shocked and inspired by the rapid advancement going on in the industry while I was away. One thing has been abundantly clear: security is changing.
I'm excited that I get an opportunity to work on some of the most important problems facing our industry today. And I get to play a meaningful part in discovering, and contributing, to the next generation of strategies required to secure this burgeoning technology.
d0nut 🦀 💜 retweeted
Replying to @4A4133
disclosing ANOTHER bug today is like proposing at someone else's wedding
php2shell is the most consequential vulnerability I have ever helped discover. I am proud of how our team worked closely in coordination with the PHP Foundation to provide support and to harden the patch in preparation for this release.
Please read more about our approach:
OpenAI models helped researchers—operating as part of our Patch the Planet initiative—discover critical security flaws in PHP, an open-source programming language used to run an estimated 70% of websites.
Over the past two months, we led a coalition of maintainers, researchers, and security providers to prepare fixes and protections ahead of disclosure. This duration was necessary because the fix was quite intricate and required a major change to the PHP engine. Every site using PHP can now safely upgrade their version to stay secure, in addition to applying mitigations from various security vendors.
Due to the severity of these flaws and PHP’s widespread use, we consider this bug to be one of the most impactful vulnerabilities in recent memory. It also marks a new phase, where AI can find security bugs with internet-scale impact.
This is an example of the Defender’s Window in action: to our knowledge, frontier AI was able to find this vulnerability ahead of attackers, giving defenders time to prepare.
openai.com/index/coordinated…
Readers added context they thought people might want to know
OpenAI may claim a role in the coordinated response and patching process. But the initial discovery and exploit development, however, occurred several months earlier by an independent researcher.
x.com/lcfr_hax/statu…
d0nut 🦀 💜 retweeted
Node.js Security Advisory: a high-severity RCE flaw in Node's Brotli decoder affects Node.js 22, 24, and 26.
Vercel WAF rules are live for every project and block known exploit patterns.
vercel.com/kb/bulletin/node-…
gotta give it to @OpenAI and their sane daybreak program
heif heist by harsh
kvmescape by paulos
php2shell by lcfr
gitlab rces by joaxcar
chrome full chain by moyix
wordpress rce by hashkitten
all largely thanks to openai daybreak giving researchers access to gpt 5.6 sol.
d0nut 🦀 💜 retweeted
Attack surface reduction is the one thing that reliably works.
Reducing the attack surface of deployed services and apps is a fundamental component of software that is secure by design. Earlier this year we tasked Claude with autonomously mapping and reducing the attack surface of 25 large and widely used OSS codebases. This blog post covers some of our methodology and a preview of the data we collected.
This research resulted in a significant reduction in OpenSSH pre-authentication attack surface (now fixed in 10.6). And over 500 findings where reachability could be reduced and configurations hardened to ensure security controls weren’t silently disabled.
anthropic.com/research/attac…
Replying to @d0nutptr
d0nut 🦀 💜 retweeted
If you run PHP please:
session.upload_progress.enabled = Off
php_admin_flag session.upload_progress.enabled Off






















