Hermes Agent Security: Risks and CVEs

Hermes Agent is an open-source, self-hosted Python agent from Nous Research that can retain memory, create skills, connect to messaging platforms, schedule tasks, and execute commands through local or remote terminal backends, making its security posture more consequential than that of a typical chat application. Its maintainers state that the operating system, rather than in-process safeguards such as approval prompts and content scanners, is the principal boundary against an adversarial model. As of October 26, 2026, published advisories identify multiple vulnerabilities involving supply-chain dependencies, prompt- and memory-scanning bypasses, environment and file-permission exposure, unauthenticated network endpoints, DNS rebinding, and path traversal; the most severe cited issue is a critical mutable-reference flaw in the MCP catalog fixed in version 0.19.0 or 2026.7.20. The risks correspond chiefly to OWASP categories for prompt injection, sensitive-information disclosure, excessive agency, and supply-chain vulnerabilities. Recommended mitigations include maintaining current versions, using explicit user allowlists, running the agent and preferably its full process in a container or remote environment, requiring manual or smart command approvals, limiting writable directories and credentials, operating gateways as non-root users behind VPNs or firewalls, reviewing third-party skills and plugins, and adding external identity, policy, logging, and testing controls for multi-user or enterprise deployments.

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