Chainguard Launches Harness AI Bug Hunter on Claude Marketplace
Seattle – October 14, 2026 -- Chainguard has launched Chainguard Harness, a cyber harness that runs frontier AI models such as Anthropic's Claude Mythos 5.1 against a live build of a customer's application and delivers only reproduced vulnerabilities, each paired with an engineer-reviewed fix. The product is available through the Claude Marketplace by Anthropic, so enterprises can buy it with their existing Anthropic commitment.
Harness tests running applications in isolated microVMs instead of scanning static code
Harness connects to a team's repository through the Guardener GitHub app, builds the application as it ships, and boots it in an isolated microVM. A frontier model then probes the running instance the way an attacker would. Chainguard says this approach surfaces logic flaws, injection paths and resource exhaustion bugs that appear only at runtime and that traditional static scanners miss.