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Filename Latest commit message Latest commit date
Radoslav Dimitrov 1201cbd82b
 security: fix open redirect and add small hardening (#1227) 
## What this does

Fixes an open redirect plus a handful of small, mostly-invisible
hardening changes around it.

## What's in it

- **The fix**: trailing-slash redirects no longer let `//evil.com/`
redirect off-host.
- **SSRF block** on the DNS/HTTP namespace verification — refuses to
dial loopback, RFC1918, link-local, multicast, CGNAT, or
IP-literal/single-label \"domains\".
- **Slow-client guard**: `ReadTimeout` and `IdleTimeout` on the HTTP
server (no `WriteTimeout` — would risk cutting off legitimate
multi-package publishes).
- **Defence-in-depth headers** on the UI (`/`) and 404 responses.
- **5xx responses** stop leaking raw DB error text to clients (logged
server-side instead).
- **Search filter** stops treating `%` and `_` as wildcards.
- **Validators**: PyPI/NuGet identifiers URL-escaped before fetching;
MCPB no longer follows redirects.
- **Misc**: `Version` field bounded to 255 chars; logs quote user input;
`BlockedNamespaces` denylist now catches subdomain claimants.

Each change is its own commit so they can be reviewed (or reverted)
independently.

## Test plan

- [ ] CI green
- [ ] Synthetic publish in staging for each package type (npm, pypi,
nuget, oci, mcpb) — confirms validator changes don't regress
- [ ] Quick browser check of `/` after deploy to confirm UI still loads
with the new CSP
- [ ] `curl https://<host>//evil.com/` — confirm the open redirect is
closed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-29 19:14:00 -04:00
..
administration Add registry maintainer onboarding documentation (#820) 2025-12-08 13:43:37 +00:00
contributing update schema url point to the actual location (#884) 2026-02-10 13:32:58 -08:00
design update schema url point to the actual location (#884) 2026-02-10 13:32:58 -08:00
modelcontextprotocol-io fix(auth): better DNS verification errors and wrong-selector hint (#1202) 2026-04-25 11:22:06 -04:00
reference security: fix open redirect and add small hardening (#1227) 2026-04-29 19:14:00 -04:00
community-projects.md docs: Add MCP registry browser to the community-projects.md page (#889) 2026-01-14 23:33:20 +02:00
README.md docs: fix broken links in Documentation Index (#822) 2025-12-08 13:43:16 +00:00

README.md

MCP Registry Documentation

The MCP registry provides MCP clients with a list of MCP servers, like an app store for MCP servers.

I want to...

Documentation Index