Anthropic is set to give the EU's cybersecurity agency ENISA access to its restricted Mythos model through Project Glasswing - making ENISA the first EU institution and first entity outside the US and UK to join. The move, communicated to the European Commission over the weekend, ends a weeks-long standoff after euro-area finance ministers, the ECB, and member states demanded access on learning Mythos had found flaws in systems European banks, governments, and critical infrastructure rely on. Terms covering data sovereignty, sharing findings with member states, and the scope of systems ENISA may test are still being negotiated. BNP Paribas and Mistral continue building a European alternative.
Anthropic has confirmed it will roll out Claude Mythos-class models to the general public in the coming weeks. Mythos was originally announced in April as a restricted preview available only to select security researchers and partners; Anthropic cited significant security risks if released too broadly. The company now says it has developed sufficient guardrails. Anthropic frames the trade-off as compressing the attacker advantage: 'in the short term, this could be attackers, if frontier labs aren't careful... in the long term, defenders will more efficiently direct resources and use these models to fix bugs.' Pricing and tier availability are not yet disclosed.
Anthropic appears to be preparing the public rollout of Claude Mythos - the restricted security-focused frontier model that uncovered 10,000 high or critical vulnerabilities in its first month under Project Glasswing. References to 'claude-mythos-1-preview' have briefly appeared in the public Claude Code and Claude Security products, with at least one user reportedly seeing a toggle to enable Mythos before it was pulled. Anthropic originally announced Mythos in early preview on April 7 and held back the public release pending guardrails, warning the model 'can automatically develop functional cyberattacks at a highly professional level.' Pricing and tier availability are not yet disclosed.
Anthropic has named the program behind its Claude Mythos Preview model 'Project Glasswing' and disclosed the first-month results. Working with AWS, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, the Linux Foundation, Microsoft, NVIDIA, and Palo Alto Networks, the program flagged 6,202 high or critical vulnerability candidates across 1,000+ open-source projects; 1,726 were validated by human reviewers and 1,094 confirmed as genuine high or critical severity. A WolfSSL certificate-forgery flaw (CVE-2026-5194, CVSS 9.1) is the named-and-shamed example. 97 upstream patches and 88 security advisories have landed. Anthropic itself warns that finding flaws is far easier than fixing them.
Anthropic has unveiled Claude Mythos Preview, a research-only AI model purpose-built for security tasks, and disclosed that it has used the model to find more than 10,000 high-severity vulnerabilities in widely used open-source and commercial software. Mythos has also been adapted to build end-to-end exploit chains and, in one Glasswing partner-bank case, helped block a $1.5 million fraudulent wire transfer. Anthropic is urging defenders to shorten patch windows because models with similar capability will soon be broadly available. It has launched a Cyber Verification Program that lets vetted researchers use the model without guardrails for legitimate vulnerability research, red teaming, and penetration testing.
Anthropic launched Claude Security in public beta yesterday, an enterprise tool that scans code repositories for vulnerabilities, rates each finding's severity and confidence, and generates patch instructions that engineers can apply through Claude Code. The launch is direct response to Mythos and similar AI-driven offensive tools that have been compressing the time between vulnerability disclosure and active exploitation - LiteLLM was exploited 36 hours after disclosure last week, LMDeploy in 13 hours the week before. CrowdStrike, Microsoft Security, Palo Alto Networks, SentinelOne, Trend, and Wiz are integrating Claude Opus 4.7 into their platforms.
LiteLLM, the popular open-source gateway used to centralize API access for OpenAI, Anthropic, and other AI providers, has a critical pre-authentication SQL injection bug that attackers started exploiting just 36 hours after the security advisory went public. The flaw lets anyone who can reach the proxy port read all the API keys stored inside - including master keys, virtual keys, and provider credentials. The bug was in the bearer-token check: the token was concatenated into a SQL query instead of passed as a parameter. Sysdig saw the first attack at 04:24 UTC on April 26, hitting three tables that hold the most valuable secrets.
Backfill from April 15: OX Security disclosed an architectural flaw in the official Model Context Protocol SDKs (Python, TypeScript, Java, Rust) that lets attacker-controlled JSON config trigger arbitrary OS commands via the STDIO transport. Roughly 200,000 publicly reachable MCP servers and 150 million SDK downloads inherit the issue. OX has tied 14 CVEs to the same root cause across LiteLLM (patched), Bisheng (patched), Windsurf (zero-click RCE in Cursor-style IDEs, still reported), Flowise, LangFlow, GPT Researcher, Agent Zero, and DocsGPT. Anthropic declined to patch the protocol, calling the behavior 'expected.'
Backfill from April 21: Anthropic confirmed an unauthorized Discord group quietly accessed Mythos - the company's most powerful AI cybersecurity tool, restricted to about 40 vetted partners including Apple, Microsoft, and Google. The group got in on the same day Mythos was announced (April 7) by piggybacking on a member who works at one of Anthropic's third-party contractors, then guessed the model's URL based on naming patterns from previously leaked information. Anthropic says the group used Mythos to build websites, not for attacks - but they had quiet access for two weeks. Mozilla used Mythos to find and patch 271 Firefox bugs.
TrustStrike Labs