Anthropic OSS Scanner: Free Claude Mythos Bug Scans

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Anthropic launched the Anthropic Cyber Mission on October 8, 2026, pairing OSS Scanner — a free, opt-in service that runs periodic vulnerability scans of eligible open-source projects with the company's strongest models, including Claude Mythos. The same announcement introduced the Critical Infrastructure Defense Program, which pairs frontier Claude models, on-site engineers, and Anthropic threat research with 11 founding partners that help secure operational technology behind power, water, transport, and related systems.

What happened

According to Anthropic's Cyber Mission post, the effort is a long-term commitment to support defenders with tools, research, and resources. It starts in two areas: critical infrastructure (especially operational technology and government systems) and open-source software that most applications depend on. Anthropic said frontier models can be misused to exploit vulnerabilities and run cyber operations, while defenders still face severe resource shortages.

OSS Scanner grew out of Project Glasswing, Anthropic's earlier open-source scanning work. In a companion research post, the company said some maintainers who could triage at scale asked for every model finding in their projects — reviewed or not. OSS Scanner is the opt-in fast track for those projects. SecurityWeek and The Register both covered the dual launch on October 9, 2026.

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Key details

OSS Scanner: free model scans, no human review

Per Anthropic's research post and the OSS Scanner enrollment page, enrolled projects receive periodic scans at no cost from Anthropic's strongest models. Reports are fully model-generated and sent without human review so findings reach maintainers faster. Anthropic expects a true-positive rate above 90%, while warning that some reports may still be inaccurate — for example, with a wrong severity rating.

Each report is designed to include a self-contained reproducer or proof of concept, an explanation (with a bisection to when the bug was introduced where possible), and a candidate patch when available. Anthropic said it spent several weeks validating the pipeline with dozens of open-source projects before widening access.

  • Cost: Free for enrolled eligible projects; Anthropic says the Defender Advantage Fund (0xDAF), launched in August, helps keep the service free.
  • Models: Strongest Anthropic models, including Claude Mythos.
  • Inspiration: Google's OSS-Fuzz, adapted for language-model vulnerability finding.
  • Not for everyone: Aimed at projects that can keep up with surfaced findings; others continue to receive human-verified disclosures under Anthropic's coordinated vulnerability disclosure (CVD) process.

Eligibility and how maintainers enroll

Eligibility follows criteria similar to OSS-Fuzz: established projects with a critical impact on infrastructure and user security, decided case by case. Factors include exposure to remote attacks and dependent users or projects. Core maintainers enroll by opening a pull request to the anthropics/oss-scanner GitHub repository that adds a projects/<name>/project.yaml config (repo URL, primary contact, Dockerfile path, and optional fields such as threat model or GPG key). Anthropic says it manually validates core-maintainer status before enrollment.

Glasswing scale and early accuracy checks

Over roughly the last six months of Glasswing-style scanning, Anthropic's research post said its models discovered over 29,000 candidate vulnerabilities, of which humans had manually reviewed and triaged about 6,000, while nearly 5,000 reports went directly to maintainers who asked for everything — even unverified findings. Anthropic's CVD dashboard (updated October 2, 2026) lists finer snapshot counts that may move as the ledger updates.

To validate an early OSS Scanner version, Anthropic asked expert penetration testers to check 97 critical and high-severity scanner results across 48 projects. Of those, 85 (88%) met the CVD bar; 11 were real but duplicated known issues or other findings; and only one was an invalid false positive. Maintainers quoted in the research post — including voices from PostgreSQL, OpenSSL, wolfSSL, HotCRP, and curl — described many reports as thorough and actionable, while Anthropic noted severity ratings can be inflated or a project's threat model misunderstood.

Critical Infrastructure Defense Program

The Critical Infrastructure Defense Program brings frontier Claude models, on-site engineers, and Anthropic threat research to trusted OT security providers. Founding partners named by Anthropic are Accenture, Booz Allen, CrowdStrike, Deloitte, Dragos, Hitachi, Insane Cyber, Nozomi Networks, Palo Alto Networks, PwC, and Rockwell Automation. Several partners are already working with Claude to fix vulnerabilities, Anthropic said, starting with a small cohort to learn what is practical. OT systems often cannot be taken offline to patch, so known weaknesses can linger for years — in rare cases, Anthropic said, a safe fix might take decades.

Separately, since launching a June cyber defense program for state, local, tribal, and territorial governments, Anthropic said it has offered frontier Claude models and technical support to more than half of all U.S. states and some of the country's largest public critical infrastructure operators.

Why it matters

  • Attackers already have capable models: Anthropic argues highly cyber-capable AI is widely available to adversaries, while defensive tools — including its own — have not yet reached enough of the people who need them.
  • Finding bugs is no longer the bottleneck: Anthropic and SecurityWeek both stress that discovering vulnerabilities is easier than verifying, prioritizing, and fixing them. Glasswing often saw months pass between a find and a fix.
  • Open source is shared risk: Almost all software leans on volunteer-maintained open-source code. A free, opt-in scanner with PoCs and suggested patches can help high-capacity maintainers close gaps before attackers reuse the same model skills.
  • OT is a different problem: Power, water, and transport controllers are proprietary, long-lived, and risky to change. Partnering with the firms operators already trust may matter more than dropping a general-purpose chatbot into a plant network.
  • Near-term advantage may still favor attackers: Anthropic forecasts that in about two years AI will favor defense — catching bugs before they ship — but that in the near term that may not be true. The Register put it bluntly: for now, attackers still have the upper hand.

What's next

Anthropic said it will expand the Critical Infrastructure Defense Program to more partners and sectors over the coming months and share what works — and what does not. On the open-source side, next steps include bringing OSS Scanner to more projects while keeping human-verified CVD for those that need it, automating more triage and patching where wanted, and researching harder secure architectures. OT security vendors can register interest as CIDP grows; critical open-source maintainers can enroll in OSS Scanner; and qualifying security teams can apply to the expanded Cyber Verification Program. Open questions include how enrollment demand will reshape eligibility, whether Anthropic later adds a disclosure clock to some high-severity unvalidated findings (it currently does not impose a 90-day window on them), and how true-positive and patch quality hold up as volume rises.

FAQ

What is Anthropic OSS Scanner?

OSS Scanner is Anthropic's free, opt-in vulnerability-finding service for eligible open-source projects, launched October 8, 2026 as part of the Anthropic Cyber Mission. Enrolled projects get periodic scans from Anthropic's strongest models, including Claude Mythos. Reports include a proof of concept or reproducer, an explanation, and a suggested fix when available, and are sent without human review.

Is Anthropic OSS Scanner free, and who can use it?

Yes — Anthropic says enrolled eligible projects receive scans at no cost. Eligibility is case-by-case and similar to Google's OSS-Fuzz: established projects with a critical impact on infrastructure and user security. Core maintainers enroll via a pull request to Anthropic's oss-scanner GitHub repo; Anthropic manually checks maintainer status before accepting a project.

What is the Critical Infrastructure Defense Program?

It is the other half of the Anthropic Cyber Mission announcement: a program that brings frontier Claude models, on-site engineers, and Anthropic threat research to providers that secure operational technology. Its 11 founding partners are Accenture, Booz Allen, CrowdStrike, Deloitte, Dragos, Hitachi, Insane Cyber, Nozomi Networks, Palo Alto Networks, PwC, and Rockwell Automation.

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