Chainguard launches Harness to find and fix vulnerabilities using Anthropic’s Claude Mythos 5.1
Chainguard introduced Harness, a cybersecurity tool that scans live applications for exploitable vulnerabilities using Anthropic’s Claude Mythos 5.1 model. The tool runs code in an isolated microVM, identifies real-world flaws, and provides ready-to-merge fixes—without requiring organizations to own their own frontier AI models.
Key points
- Chainguard Harness uses Anthropic’s Claude Mythos 5.1 to scan live applications for exploitable vulnerabilities in isolated microVMs
- Provides reproducible fixes for both open-source and first-party code, reducing false positives from traditional scanners
- Available via the Claude Marketplace, priced as part of Anthropic’s AI spend consolidation for customers
Harness targets a gap in traditional vulnerability scanners, which often flag false positives or miss runtime flaws. Chainguard claims the tool has uncovered serious vulnerabilities in code previously deemed secure, including critical infrastructure software. It is now available via the Claude Marketplace, allowing customers to purchase it directly from Anthropic. The company positions Harness as a way for security teams to act on proven findings without wasting time on unverified alerts.
The story so far
2 episodes →- Chainguard launches Harness to find and fix vulnerabilities using Anthropic’s Claude Mythos 5.1this story
Introducing Chainguard Harness: Proven Vulnerabilities and Ready-to-Merge Fixes From Frontier AI, No Model Access Required
finance.yahoo.com · 13 October 2026
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Coverage and discussion
2sources- Chainguard Introduces Harness for Frontier-AI Vulnerability HuntingPress · Unite.AI ·
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