Atlas / MCP servers / hyper-mcp-rs / Hyper

HyperCAUTION

mcp/hyper-mcp-rs/hyper-2

📦️ A fast, secure MCP server that extends its capabilities through WebAssembly plugins.

Verdict
CAUTION
Grade
C
Trust score
74 /100
Exposed tools
—
Transport
stdio
License
Apache-2.0
Stars
882
01

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

[](https://crates.io/crates/hyper-mcp) [](#license) [](https://github.com/hyper-mcp-rs/hyper-mcp/issues)

A fast, secure MCP server that extends its capabilities through WebAssembly plugins.

What is it?

hyper-mcp makes it easy to add AI capabilities to your applications. It works with Claude Desktop, Cursor IDE, and other MCP-compatible apps. Write plugins in your favorite language, distribute them through container registries, and run them anywhere - from cloud to edge.

Features

  • Write plugins in any language that compiles to WebAssembly
  • Distribute plugins via standard OCI registries (like Docker Hub)
  • Built on Extism for rock-solid plugin support
  • Sanboxing with WASM: ability to limit network, filesystem, memory access
  • Lightweight enough for resource-constrained environments
  • Support stdio transport protocol
  • Deploy anywhere: serverless, edge, mobile, IoT devices
  • Cross-platform compatibility out of the box
  • Support tool name prefix to prevent tool names collision
  • Dynamic plugin loading and unloading (configurable)

Security

Built with security-first mindset:

  • Sandboxed plugins that can't access your system without permission
  • Memory-safe execution with resource limits
  • Secure plugin distributio
Read from source at commit 2c1d49372e79OBSERVED · 2026-09-26
02

Trust audit

CAUTIONgrade C · trust 74/100 Install with care. The audit found things worth knowing before you trust its output.

LayerWhat it checksResult
L0Provenance & inventoryPASS
L1Static analysis of the codeWARN
L2Instruction surface (what it tells the agent)PASS
L3Class-specific surfacePASS
L4Behavioural (sandbox)SKIPPED

What the source does

Filesystem
declared (2 observation(s))
Network
declared (5 observation(s))
Shell
none-observed
Dependencies
pinned
Secrets in source
found

Findings (20)

MEDIUMNetwork egress · net.raw_ip · CWE-200, CWE-319
src/config.rs:2088
let ip_url = Url::parse("https://192.168.1.100:443").unwrap();
MEDIUMNetwork egress · net.raw_ip · CWE-200, CWE-319
src/wasm/http.rs:450
let url = Url::parse(&format!("http://127.0.0.1:{}/test.wasm", addr.port())).unwrap();
MEDIUMNetwork egress · net.raw_ip · CWE-200, CWE-319
src/wasm/http.rs:486
let url = Url::parse(&format!("http://127.0.0.1:{}/public.wasm", addr.port())).unwrap();
MEDIUMNetwork egress · net.raw_ip · CWE-200, CWE-319
src/wasm/http.rs:488
let base_url = Url::parse(&format!("http://127.0.0.1:{}", addr.port())).unwrap();
MEDIUMNetwork egress · net.raw_ip · CWE-200, CWE-319
src/wasm/http.rs:544
let url = Url::parse(&format!("http://127.0.0.1:{}/cached.wasm", addr.port())).unwrap();
MEDIUMHard-coded secrets · secret.generic · CWE-798, CWE-321
RUNTIME_CONFIG.md:433
token: "ghp_1234567890abcdef"
MEDIUMHard-coded secrets · secret.generic · CWE-798, CWE-321
src/config.rs:1195
token: "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ".to_string(),
MEDIUMHard-coded secrets · secret.generic · CWE-798, CWE-321
tests/fixtures/documentation_example.yaml:8
token: "ghp_1234567890abcdef"
LOWInventory / provenance · inv.hidden_file · CWE-1104
.hadolint.yaml
.hadolint.yaml
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWInventory / provenance · inv.hidden_file · CWE-1104
.pre-commit-config.yaml
.pre-commit-config.yaml
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWInventory / provenance · inv.hidden_file · CWE-1104
iac/.terraform.lock.hcl
.terraform.lock.hcl
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWPrompt injection · prompt.authority_framing · CWE-94, CWE-1427
RUNTIME_CONFIG.md:975
Rather than allowing plugins unrestricted access to the system keyring, `allowed_secrets` implements a principle of least privilege by specifying exactly which keyring entries a plugin may access. Thi
LOWPrompt injection · prompt.credential_read · CWE-94, CWE-1427
RUNTIME_CONFIG.md:191
1. Open Keychain Access (Applications → Utilities → Keychain Access)
Why it matters. asks the agent to read credentials
LOWPrompt injection · prompt.credential_read · CWE-94, CWE-1427
RUNTIME_CONFIG.md:236
1. Open "Credential Manager" from Control Panel → User Accounts → Credential Manager
Why it matters. asks the agent to read credentials
LOWPrompt injection · prompt.credential_read · CWE-94, CWE-1427
RUNTIME_CONFIG.md:1045
The plugin can only access these specific database credentials, not other secrets in the keyring.
Why it matters. asks the agent to read credentials
LOWSupply chain · prompt.pipe_to_shell · CWE-829, CWE-1357
CREATING_PLUGINS.md:39
curl https://static.dylibso.com/cli/install.sh -s | bash
LOWInventory / provenance · mcp.no_tools_extracted · CWE-1104
server.json
Why it matters. the tool list is enumerated at runtime by tools/list, not declared in source
Fix. the page says so rather than showing an empty table
INFOInventory / provenance · inv.oversize · CWE-1104
assets/cursor-mcp-1.png
assets/cursor-mcp-1.png
Why it matters. 1183602 bytes not read
INFOInventory / provenance · inv.oversize · CWE-1104
assets/cursor-mcp.png
assets/cursor-mcp.png
Why it matters. 2014390 bytes not read
INFOInventory / provenance · inv.oversize · CWE-1104
assets/logo.png
assets/logo.png
Why it matters. 1486234 bytes not read

Gates applied: no_behavioural_pass.

Audited 2026-09-26 · audit v0.4.1 · source sha 2c1d49372e79full audit observations/trust-audit/mcp-server/hyper-mcp-rs__hyper-2.json · Report an issue / request a re-scan
03

Audit history

Every audit this server has had. A grade with a past is a grade somebody is still checking.

DateSourceVerdictGradeScoreChange
2026-09-262c1d49372e79CAUTIONC74first audit
04

Questions

What is the Hyper MCP server?

📦️ A fast, secure MCP server that extends its capabilities through WebAssembly plugins.

Is Hyper safe to connect to an agent?

With care. The audit graded it C (74/100) and found 20 things worth knowing before you trust this server, listed below with the exact line each was found on.

What credentials does Hyper need?

No credential environment variables were found in its source, so it appears to need none.

How does Hyper run?

It speaks stdio, so it runs as a local process your client starts.

How current is this page?

The grade is for one exact copy of the source (2c1d49372e79), read on 2026-09-26. The repository is watched and re-audited when it changes.

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