build(deps-dev): bump miniflare from 4.20260515.0 to 4.20260526.0

[dependabot]

Bumps miniflare from 4.20260515.0 to 4.20260526.0.

Release notes

Sourced from miniflare's releases.

miniflare@4.20260521.0

Patch Changes

• #13993 0733688 Thanks @​dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260520.1	1.20260521.1

• #13999 30657e1 Thanks @​edmundhung! - Fix TCP requests failing when outboundService is configured

  Workers using outboundService can now open TCP connections with cloudflare:sockets. Previously, TCP requests could throw an error when a custom outbound service was configured.

miniflare@4.20260520.0

Patch Changes

• #13978 fa1f61f Thanks @​sassyconsultingllc! - Bump ws from 8.18.0 to 8.20.1 to address GHSA-58qx-3vcg-4xpx

  GHSA-58qx-3vcg-4xpx / CVE-2026-45736 reports an uninitialized-memory disclosure in ws@<8.20.1 when a TypedArray is passed as the reason argument to WebSocket.close(). The fix shipped in ws@8.20.1 on 2026-05-12. This change bumps the workspace catalog entry so that miniflare, wrangler, and @cloudflare/vite-plugin all pick up the patched release.

• #13977 2679e05 Thanks @​dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260518.1	1.20260519.1

• #13984 7e40d98 Thanks @​dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260519.1	1.20260520.1

• #13912 d803737 Thanks @​petebacondarwin! - Fix /cdn-cgi/* host validation incorrectly accepting subdomains of exact configured routes

  Miniflare's /cdn-cgi/* host/origin validator was treating exact configured routes the same as wildcard configured routes, so a request whose Host or Origin hostname was a subdomain of an exact route (e.g. sub.my-custom-site.com for a my-custom-site.com/* route) was incorrectly accepted. Exact configured routes and the configured upstream hostname are now required to match the request hostname exactly. Subdomain matching is only applied to wildcard routes such as *.example.com/*. Localhost hostnames continue to be allowed as before.

  This affects wrangler dev and local development through @cloudflare/vite-plugin, both of which use Miniflare under the hood.

• #13971 59cd880 Thanks @​petebacondarwin! - Improve error diagnostics in the Browser Run binding worker

  When the local Browser Run binding failed to reach an upstream — for example when Chrome failed to launch and miniflare's loopback /browser/launch endpoint returned a 500 with a stack-trace text body — the binding worker would call response.json() on the non-JSON body and throw an opaque SyntaxError: Unexpected token X, "..." is not valid JSON. The actual upstream error message (e.g. Chrome readiness probe at ... timed out after 5000ms) was discarded.

  The binding worker now reads the response body as text first, surfaces the HTTP status and body content in the thrown error, and chains the original SyntaxError via cause when the body was a 2xx response that didn't parse as JSON. This makes both local-dev failures and CI test flakes self-diagnosing.

... (truncated)

Changelog

Sourced from miniflare's changelog.

4.20260526.0

Patch Changes

• #14003 c1fd2fd Thanks @​dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260521.1	1.20260526.1

• #14011 420e457 Thanks @​petebacondarwin! - Warn when a remote-bindings request is blocked by Cloudflare Access

  When wrangler dev is used with remote bindings and a request from the local remote-bindings proxy client to the remote workers.dev proxy server is blocked by Cloudflare Access (HTTP 403 with the Cloudflare Access block page), Wrangler now:

  • Logs a single, visually striking warning per dev session explaining how to set CLOUDFLARE_ACCESS_CLIENT_ID / CLOUDFLARE_ACCESS_CLIENT_SECRET (Service Token credentials) or run cloudflared access login to authenticate.
  • Replaces the original Access HTML block page with a readable plain-text body containing the same guidance, so the message also reaches the user via binding error messages (e.g. InferenceUpstreamError from env.AI.run()) and any browser response piped back via a service binding .fetch().

  Previously the 403 was returned to user code with the full Access HTML, which both drowned out other logs and made it hard to tell that the failure was due to Cloudflare Access on workers.dev rather than a problem in the binding itself or the deployed proxy server. The detection runs inside the proxy client worker (which only ever talks to the remote-bindings proxy URL), so it does not trigger false positives on user-worker 403s.

4.20260521.0

Patch Changes

• #13993 0733688 Thanks @​dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260520.1	1.20260521.1

• #13999 30657e1 Thanks @​edmundhung! - Fix TCP requests failing when outboundService is configured

  Workers using outboundService can now open TCP connections with cloudflare:sockets. Previously, TCP requests could throw an error when a custom outbound service was configured.

4.20260520.0

Patch Changes

• #13978 fa1f61f Thanks @​sassyconsultingllc! - Bump ws from 8.18.0 to 8.20.1 to address GHSA-58qx-3vcg-4xpx

  GHSA-58qx-3vcg-4xpx / CVE-2026-45736 reports an uninitialized-memory disclosure in ws@<8.20.1 when a TypedArray is passed as the reason argument to WebSocket.close(). The fix shipped in ws@8.20.1 on 2026-05-12. This change bumps the workspace catalog entry so that miniflare, wrangler, and @cloudflare/vite-plugin all pick up the patched release.

• #13977 2679e05 Thanks @​dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  | Dependency | From | To |

... (truncated)

Commits

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Summary by cubic

Bump miniflare to 4.20260526.0 to pick up a security patch and stability improvements for local Workers development. This also updates workerd and improves diagnostics for remote bindings.

• Dependencies
  • Dev-only: miniflare ^4.20260526.0
  • Pulls in ws@8.20.1 (fixes GHSA-58qx-3vcg-4xpx) and workerd@1.20260526.1
  • Upstream fixes: TCP with outboundService, stricter /cdn-cgi/* host validation, clearer Cloudflare Access 403 warnings, and improved Browser Run error messages

^{Written for commit ec5c75a. Summary will update on new commits. Review in cubic}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	miniflare@​4.20260515.0 ⏵ 4.20260526.0	+1			+1

View full report