MCP, MCP server
Tunnel Client
Customer-run client for Secure MCP Tunnel: connect private or localhost MCP servers to ChatGPT, Codex, the Responses API, and AgentKit without exposing them to the public internet.
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High finding. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit ed777294b81a.
NETWORK_HOST_FROM_INPUT SECRETS_PATH_CREDENTIAL OBFUSCATION_ENCODED_BLOB OBFUSCATION_MINIFIED_PAYLOAD
Why this grade
- NETWORK_HOST_FROM_INPUT Medium
A file takes a URL or endpoint as input and has no fixed host list.
pkg/adminui/assets/app.js, line 1
o);async function mn(e,t){const n=await fetch(e,{cache:"no-store",...t});if(!n.ok)thro - SECRETS_PATH_CREDENTIAL Medium
Mentions a credential store path (~/.ssh, id_rsa, .npmrc, .aws/credentials, credentials.json, .netrc).
plugins/tunnel-mcp/mcp/server.test.cjs, line 211
mcp_command: "AWS_SHARED_CREDENTIALS_FILE=/home/me/.aws/credentials node server.js", - OBFUSCATION_ENCODED_BLOB Medium
Contains a long base64 shaped string in a file that should be readable.
compliance/tunnel-client-runtime-cloudflared.spdx.json, line 1
{ - OBFUSCATION_MINIFIED_PAYLOAD Medium
Contains a very long line with almost no spaces in a script or style file.
compliance/tunnel-client-runtime-cloudflared.spdx.json, line 1
{
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Note
requests shell access. The manifest names this permission.
PERMISSION_SHELL_DECLARED
cmd/client/codex_command.go, line 620
cmd := exec.Command(name, args...)
cmd/client/profile_editor.go, line 63
return exec.Command(executable, append(parts[1:], profilePath)...), nil
cmd/client/runtimes_command_test.go, line 42
cmd := exec.Command(os.Args[0], "-test.run=^TestRuntimesManagedProcessHelper$")
Show more
e2e/proxy_e2e_test.go, line 98
cmd := exec.CommandContext(ctx, executable,
e2e/runtime_artifacts_e2e_test.go, line 974
cmd := exec.Command(
e2e/runtime_artifacts_e2e_test.go, line 1075
cmd := exec.Command(binary, args...)
pkg/adminui/codex.go, line 427
cmd := exec.Command(name, args...)
pkg/adminui/startup.go, line 264
cmd = exec.Command("open", url)
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Serious
accepts a host from input, with no fixed list in this file.
NETWORK_HOST_FROM_INPUT
pkg/adminui/assets/app.js, line 1
o);async function mn(e,t){const n=await fetch(e,{cache:"no-store",...t});if(!n.ok)thro
pkg/adminui/assets/app.js, line 7
te=()=>{e.$$.dirty[0]&16777216&&n(13,s=`curl -fsSJO "${O}"`),e.$$.dirty[0]&4194304&&n
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_CREDENTIAL
cmd/client/main_test.go, line 622
if expectedTokenDigest := os.Getenv("DELAYED_CLOUDFLARED_EXPECT_TOKEN_SHA256"); expectedTokenDigest != "" {
cmd/client/main_test.go, line 623
actualTokenDigest := sha256.Sum256([]byte(os.Getenv("TUNNEL_TOKEN")))
plugins/tunnel-mcp/mcp/server.test.cjs, line 211
mcp_command: "AWS_SHARED_CREDENTIALS_FILE=/home/me/.aws/credentials node server.js",
Show more
pkg/cloudflared/runtime/supervisor_test.go, line 520
_, _ = fmt.Fprintln(os.Stdout, os.Getenv("TUNNEL_TOKEN"))
plugins/tunnel-mcp/mcp/server.test.cjs, line 222
"node server.js --credentials-file credentials.json --token-file token.txt --api-key-file key.pem",
plugins/tunnel-mcp/mcp/server.test.cjs, line 1467
credentials_path: "/home/me/.aws/credentials",
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Concern
contains an encoded blob in a file that should be readable. contains a minified payload.
OBFUSCATION_ENCODED_BLOB OBFUSCATION_MINIFIED_PAYLOAD
compliance/tunnel-client-runtime-cloudflared.spdx.json, line 1
{
compliance/tunnel-client-runtime.spdx.json, line 1
{
compliance/tunnel-client.spdx.json, line 1
{
Show more
pkg/adminui/assets/app.js, line 1
var go=Object.defineProperty;var bo=(e,t,n)=>t in e?go(e,t,{enumerable:!0,configurable:!0,writable:!0,value:n}):e[t]=n;var an=(e,t,n)=>bo(e,typeof t!="symbol"?t+"":t,n);function Re
pkg/adminui/assets/app.js, line 3
detail, open <a href="/metrics" target="_blank" rel="noreferrer">/metrics</a>.`,pe=d(),fe=a("details"),ie=a("summary"),ie.textContent="Raw metrics",K=d(),ee=a("pre"),de=g(x),ye(i,"
pkg/adminui/assets/app.js, line 7
${e}`:Ti(e):"—"}function sn(e){return e!=null&&e.route_mode?e.route_mode==="proxy"?"proxy":e.route_mode==="direct"?"direct":"unknown":"unknown"}function ys(e){return e==="proxy"?"o
pkg/adminui/assets/app.js, line 9
`):""}function ta(e,t,n){let{active:s=!1}=t,o=null,u=[],i=[],c=[],f="not_ready",h=!1,_=!1,m="",b="-",p="No active chat",v="",k,y,S="",P="",E="",R=!0,N=!1,J="",U=!0,I=!1,O=!1,A=!1,L
pkg/healthurl/healthurl_test.go, line 1
package healthurl
pkg/controlplane/internal/testdata/routing_sequences.json, line 440
"response": {"status": 409, "headers": {"X-Tunnel-Shard-Token": ["xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit ed777294b81a. requests shell access. The manifest names this permission. accepts a host from input, with no fixed list in this file. reads a credential or environment file. contains an encoded blob in a file that should be readable. contains a minified payload.
Date and source
Date checked:
github.com
Commit graded: ed777294b81afea47cb4d78c576a4d274d9d4e1c
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.