Security REsearch @Anthropicai · Breaking & Fixing AI Failure Modes | Founder @binarly_io · @SBOM_Tools · @REhints | Author “Rootkits & Bootkits" (bootkits.io)

San Francisco, CA
AI-assisted research is killing embargoes. Coordinated disclosure will never be the same. The industry used to have the luxury of testing or sitting on a fix for months. Not anymore. When everyone's using the same tools and the same intelligence to find vulnerabilities, you're not the only one finding that bug. Product security and PSIRT need a serious rethink: less gatekeeping, more proactive evaluation of security posture, and shipping fixes continuously at scale. The biggest impact will be in firmware and hardware, where disclosure timelines have historically stretched past 12 months. That mindset is a leftover from outdated processes and slow testing and bring-up environments.
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Reminder: It has been 16 years since Stuxnet was found -- an autonomous self-replicating worm designed to spread across multiple platforms and sabotage nuclear enrichment equipment. If small models might soon be able to copy themselves around that's not a step-change.
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Honestly impressed with Claude Opus 5.5 on this one.
We made an anime about SBOMs (with a lot of help from @claudeai). Then shipped v0.3.0 🎉 CBOMs now get checked against CNSA 2.0 + post-quantum rules, and if sbom-tools can't tell what an algorithm is. github.com/sbom-tool/sbom-to…
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Exciting work from @willzhou97 (Fellow, now full time!) and @bucketofkets on the Frontier Red Team. One of the cool parts of the job is seeing a future world early. We think this one is ~pretty underpriced. "We should aim to harden our systems to make it difficult for such replicators to spread, but also prepare to deal with a world where they are here to stay."
Anthropic's Frontier Red Team believes small AI models may now be months away from being capable of self replicating without access to a datacenter. Quoting from the blog: 'The capabilities that make AI models generally powerful coding agents also generalize to cyber tasks, including autonomous replication. Like coding agents in 2024, we’re seeing signs of life for AI worms. We don’t yet have a full rogue replicator, but agents are becoming increasingly capable of completing the individual steps in the replication chain (and passing on their adaptations to future copies of themselves). At the same time, increasing amounts of inference compute are now available both inside and outside of datacenters (see Appendix D). It’s uncertain exactly what form autonomous AI replication will take. It could be a slow, distributed “digital slime mold,” living on relatively insecure compute. It could also be a powerful cyber model that breaches datacenters at a high pace, or a model that scams people for compute credits. As a prediction that goes beyond our experiments, we expect a future awash with agents running on all types of hardware, including some that aren’t under human control. While it’s true that IoT devices have been vulnerable for a long time, lightweight agents may be much more willing than human attackers to put in the effort to compromise large fractions of the world’s IoT compute. The rise of slow replicators would also be a bellwether for more aggressive, faster ones that can breach more hardened machines or be effective API key thieves. We should aim to harden our systems to make it difficult for such replicators to spread, but also prepare to deal with a world where they are here to stay.'
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The Phrack 73 prophile of @halvarflake A must-read from one of the legends of vulnerability research. archives.phrack.org/dl/73/ha…
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To secure open-source software, we’re launching OSS Scanner. We’ll use our frontier models to periodically scan opted-in open-source projects for vulnerabilities, at no cost. Our reports will provide a proof-of-concept, explanation, and suggested fix. anthropic.com/research/launc…
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We’re launching the Anthropic Cyber Mission, a new effort to secure critical infrastructure and open-source software. anthropic.com/news/anthropic…
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Replying to @kmad @matthew_pines
I think we might lose public key cryptography.
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We’re expanding our Cyber Verification Program to give security professionals broader access to our most capable models. Through this program, verified security professionals can access Claude Mythos 5.1, Opus 5.5, and Sonnet 5.5 with safeguards designed for defensive work. We’re also opening up new tiers to allow for authorized offensive work, like penetration testing and red-teaming. anthropic.com/news/cyber-ver…
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Alex Matrosov retweeted
"not accepting attack surface in the design phase" is the *biggest* leverage we have, and it's ridiculous how rarely this is done in reality.
Agree on verification, but I'd push it further. Memory safety is a symptom, not the cause. We got here because of design decisions and trade-offs we made all along, and you can see it in pretty much every recent Linux kernel disclosure. Throwing more tokens at the attack surface won't save us either. Nothing we have today is ready for AI-driven vuln research at this scale, and finding and fixing bugs with AI doesn't change that. What we actually need is redesign and architecture validation with AI, formal methods where we can, and not accepting attack surface at the design phase in the first place. That's just not how we build software today. Patching known bugs doesn't touch the root cause, and hardware has the same problem.
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Agree on verification, but I'd push it further. Memory safety is a symptom, not the cause. We got here because of design decisions and trade-offs we made all along, and you can see it in pretty much every recent Linux kernel disclosure. Throwing more tokens at the attack surface won't save us either. Nothing we have today is ready for AI-driven vuln research at this scale, and finding and fixing bugs with AI doesn't change that. What we actually need is redesign and architecture validation with AI, formal methods where we can, and not accepting attack surface at the design phase in the first place. That's just not how we build software today. Patching known bugs doesn't touch the root cause, and hardware has the same problem.
Security will become a larger and larger function in software companies. Security is verification engineering (eg: “my code is probably memory-safe”), as well as capital allocation (“what surface should I throw most tokens at?”) For startups, it’s a challenge and opportunity. As the world’s paranoia grows given ever-more-sophisticated AI adversaries, how can you trust a 2-person-and-a-dog company? But conversely, given the dire state of global cybersecurity and increasing reliance on centralization, as always, there’re vast areas that small teams can now disrupt that I’m excited to invest in.
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I started learning low-level software when reading and implementing graphics engines. In the mid 90s, you wrote hand-optimized assembly to render via the CPU. The first x86 assembly I ever wrote was an anti-aliased scanline renderer. Analyzing this bug was blast from the past.
CVE-2026-86950: The Great Glyph Grift calif.io/research/the-great-…
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Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family. It’s a clear upgrade over Sonnet 5, runs more than 30% faster, and costs up to 30% less for most work.
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Replying to @ZackKorman
This topic is more complicated than it looks. As an industry, we've definitely made a lot of progress in cyber over the years. But this is different, very different from what we've dealt with before. Look at the spike in fixed vulnerabilities across all the big vendors. And this isn’t a one-off event, it's a continuous trend. What it shows is that our understanding of cybersecurity in general is right, but the way we've solved these problems in the past is not. AI is exposing all the obscurity and complexity across the tech stack, including hardware, in exactly the places where problems were traditionally hard for human researchers to find. At the same time, threat actors are getting a force multiplier from AI without investing in new resources or building new expertise. And on top of that, every new model outpaces the previous one, so yesterday's statements and assumptions quickly become wrong. This isn't a static risk. It's highly dynamic, and things are changing and escalating far faster than the industry, or the tech stack, can react.
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Our CFP is open and we're especially looking for hacking magic 👾🪩🪄 Learn more about the content we're looking for on our Sessionize! sessionize.com/districtcon
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Another point, the HW and FW security boundaries are our last frontier for building real hardwired boundaries for virtualization, memory isolation, and hardened agent sandboxing. In the end, the whole confidential computing movement is more about cloud cost optimization than anything else. It's just broken by design, you can't build a secure stack if what's underneath has been broken for many years.
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Our craziest escape yet: The @Accomplish_ai research team was able to exploit a vulnerability in Cloudflare Containers that let a sandbox read other customers' files - SQLite DBs, Chromium profiles, .env files etc, Cloudflare Sandboxes and Browser Run run on the same disk implementation and were affected too. We reported this to @Cloudflare, who super quickly fixed it. Read @CloudflareDev post in collaboration with Accomplish researcher @orenyomtov on their official blog: blog.cloudflare.com/containe…
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As Flare-On starts I am happy to announce the official Hex-Rays IDA MCP Server is out! 🥳 Details and links below ⬇️
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I'm hiring an exceptional Offensive Security Researcher for my team at NVIDIA (Offensive Security Research - OSR). Firmware, microcode, RISC-V, hypervisors, and shipping mitigations like HW CFI, Memory Tagging, and Pointer Masking from the ground up. jobs.nvidia.com/careers?quer…
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