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Anthropic's Claude Mythos AI Finds Crypto Library Flaws in TLS, AES-GCM and SSH

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Anthropic announced on April 7, 2026, that its Claude Mythos Preview AI model identified implementation vulnerabilities in widely used cryptographic libraries supporting TLS, AES-GCM, and SSH protocols. The findings, part of Project Glasswing — Anthropic's defensive AI-assisted security research initiative — suggest the flaws could enable certificate forgery or decryption of communications. Notably, the vulnerabilities lie in how cryptographic standards are implemented in code, not in the underlying standards themselves. One affected library, Botan, received a patch for a certificate-authentication bypass on the same day as the announcement, while two other reported vulnerabilities remained unpatched. Anthropic said it is following coordinated disclosure practices and will publish additional details as fixes become available.

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Anthropic's Claude Mythos AI Finds Crypto Library Flaws in TLS, AES-GCM and SSH · ShortSingh