mcp-mermaid@0.3.5
VERIFIED· not startedPublisher claims: "MCP Server for generating Mermaid diagrams with built-in features" Observed in sandbox: no network, touches nothing outside the project, writes no memory.
Registry PyPI (MCP server)Publisher your-username · publishing for 575 daysInstalls 107Last detonated 6d ago
Coverage
Not started: dependency install failed; the server itself was not observed.- Tested
- the dependency install step · every file read, file written and host contacted by what ran
- Not tested
- server startup · the tool list · tool behavior
What this means for the label: Verified here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.
Before you give it your token
- It will ask for
- no credential variables read in the code
- Where it talks to
- no vendor host named in the codeAlso imgbb.com — not the publisher's domain; check what for before connecting.
- What the honeypot saw
- no credential files read · no network
- What we could not test
- server startup · the tool list · tool behavior
Connect it under the guard. Not started: dependency install failed; the server itself was not observed. The code names no credential variable; the guard pins the network to what the honeypot saw and logs every call.
$vet-skills run --net declared -- uvx mcp-mermaid
Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.
Is [email protected] safe to install?
KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios; not started: dependency install failed; the server itself was not observed) on 2026-11-08 and scored it 81/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: no network, touches nothing outside the project, writes no memory.
Behavior trace
Honeypot run · 0 s · 2 scenarios · 0 deviationst+CategoryObserved action
0.0sprocessno install scripts in bundle
0.1sprocessdependency install exit 1 ·
0.1sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.1sprocessscript backend runs setup only
0.1sprocessno install scripts to re-run
Static findings
MEDIUM
Access to sensitive file pathsMakefile:217 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files
AST05echo "创建.env文件..."; \Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.HIGH
Privileged sudo commandsrc/mcp_mermaid/core/font_checker.py:144 · Privileged sudo command — agent may execute with elevated privileges
AST05sudo pacman -S noto-fonts-emojiFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.HIGH
Privileged sudo commandsrc/mcp_mermaid/core/font_checker.py:155 · Privileged sudo command — agent may execute with elevated privileges
AST05sudo cp NotoColorEmoji.ttf /usr/share/fonts/Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.HIGH
Privileged sudo commandsrc/mcp_mermaid/core/font_checker.py:128 · Privileged sudo command — agent may execute with elevated privileges
AST05sudo apt updateFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.MEDIUM
Access to sensitive file pathsMakefile:218 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files
AST05echo "# MCP-Mermaid 开发环境配置" > .env; \Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.MEDIUM
Access to sensitive file pathsMakefile:216 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files
AST05@if [ ! -f .env ]; then \Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.HIGH
Privileged sudo commandsrc/mcp_mermaid/core/font_checker.py:138 · Privileged sudo command — agent may execute with elevated privileges
AST05sudo dnf install google-noto-emoji-color-fontsFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.MEDIUM
Access to sensitive file pathsMakefile:219 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files
AST05echo "PYTHONPATH=./src" >> .env; \Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.HIGH
Privileged sudo commandsrc/mcp_mermaid/core/font_checker.py:129 · Privileged sudo command — agent may execute with elevated privileges
AST05sudo apt install fonts-noto-color-emojiFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.MEDIUM
Python subprocess execution detectedscripts/build_and_publish.py:21 · Python subprocess execution detected
AST05result = subprocess.run(cmd, shell=True, check=check, capture_output=True, text=True)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Python subprocess execution detectedscripts/manual_publish.py:16 · Python subprocess execution detected
AST05result = subprocess.run(cmd, check=True, capture_output=True, text=True)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Python subprocess execution detectedscripts/mermaid_to_imagebb.py:210 · Python subprocess execution detected
AST05result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Hex-encoded string detectedtests/test_real_environment.py:333 · Hex-encoded string detected — may contain obfuscated payloads
AST07b"\x00\x01\x02\xb5\x9c\xf2\x00\x00\x00\x00IEND\xaeB`\x82"Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.MEDIUM
Python subprocess execution detectedscripts/manual_publish.py:42 · Python subprocess execution detected
AST05subprocess.run(["rm", "-rf", dir_name], check=False)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
File type combined with upload actionsrc/mcp_mermaid/js/puppeteer-screenshot.js:120 · File type combined with upload action — agent may exfiltrate local data files
AST07console.log(`Screenshot saved: ${outputFile}`);Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.MEDIUM
Python subprocess execution detectedtests/test_real_environment.py:298 · Python subprocess execution detected
AST05result = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Python subprocess execution detectedsrc/mcp_mermaid/core/generator.py:174 · Python subprocess execution detected
AST05result = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Hex-encoded string detectedtests/test_integration.py:101 · Hex-encoded string detected — may contain obfuscated payloads
AST07b"\x00\x00\x00\x01\x08\x02\x00\x00\x00\x90wS\xde\x00\x00"Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.MEDIUM
Python subprocess execution detectedsrc/mcp_mermaid/core/font_checker.py:51 · Python subprocess execution detected
AST05result = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Python subprocess execution detectedtests/test_integration.py:66 · Python subprocess execution detected
AST05result = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.MEDIUM
Hex-encoded string detectedtests/test_real_environment.py:331 · Hex-encoded string detected — may contain obfuscated payloads
AST07b"\x00\tpHYs\x00\x00\x0b\x13\x00\x00\x0b\x13\x01\x00\x9a"Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.MEDIUM
Hex-encoded string detectedtests/test_integration.py:102 · Hex-encoded string detected — may contain obfuscated payloads
AST07b"\x00\tpHYs\x00\x00\x0b\x13\x00\x00\x0b\x13\x01\x00\x9a"Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.MEDIUM
Hex-encoded string detectedtests/test_real_environment.py:330 · Hex-encoded string detected — may contain obfuscated payloads
AST07b"\x00\x00\x00\x01\x08\x02\x00\x00\x00\x90wS\xde\x00\x00"Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.MEDIUM
Hex-encoded string detectedtests/test_integration.py:104 · Hex-encoded string detected — may contain obfuscated payloads
AST07b"\x00\x01\x02\xb5\x9c\xf2\x00\x00\x00\x00IEND\xaeB`\x82")Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.MEDIUM
Python subprocess execution detectedtests/test_integration.py:145 · Python subprocess execution detected
AST05result = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.Cost to the agent
Instructions loaded
≈52 tok
1 file · 49 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 0
Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.
Known vulnerabilities
No advisories in OSV for mcp-mermaid@0.3.5 as of 6d ago. This is the package itself, not its dependencies.