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Security2026-08-27 · source-backed
PR #29081, merged August 26 and in nightly v0.59.0-nightly.20260827, enforces RFC 9728 §7.7 and RFC 8414 constraints across MCP OAuth metadata discovery, dynamic client registration, and token exchange. It requires HTTPS for remote endpoints with HTTP allowed only for loopback, validates origin matching on resource_metadata in WWW-Authenticate challenges, blocks private IPv4/IPv6, link-local, IMDS at [redacted], benchmark 198.18.0.0/15 and multicast ranges, and resolves DNS asynchronously specifically to defeat rebinding (GitHub). A remote MCP server could previously steer the CLI's own OAuth flow at cloud metadata endpoints.
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Ten days from spec to shipped client. That's fast even for this ecosystem. The MCP 2026-07-28 revision replaced the bidirectional stateful protocol with request/response. Every request now independently carries protocol version, client identity and capabilities. Cloudflare's t...
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