Prompt Shield MCP Server
by mthamil107Prompt-injection firewall for LLM applications — 33 input detectors, 9 output scanners, federated ed25519-signed threat-intel feed. Apache 2.0, 1040 tests, F1 96.0% with 0% false positives. Docker, GitHub Action, LangChain/LlamaIndex/CrewAI integrations.
Prompt Shield is an open-source mcp server by mthamil107, written mainly in Python, with 18 GitHub stars and the Apache-2.0 license. Its code was last updated Oct 28, 2026.
Scan summary: scanned Nov 5, 2026 at commit 4ba3a54. Seen able to run shell commands, connect to the internet. Scan policy
ScannedScanned. The automated checks below ran on the commit shown. Read each line for what was and was not covered.
Full scan at
4ba3a54 · Nov 5, 2026 ScannedStatic, secrets and dependency checks completed with no critical findings. BuildsIt installed from a fresh machine.
Warning. This check found something worth reading in the findings below. It is not proof of a problem.Static code scanwarnWarning. This check found something worth reading in the findings below. It is not proof of a problem.
Passed. This check ran and found nothing it flags.Secrets scanpassPassed. This check ran and found nothing it flags.
Flagged. This check found an issue. See the findings below.Dependency audit12 known vulnerabilitiesfailFlagged. This check found an issue. See the findings below.
Warning. This check found something worth reading in the findings below. It is not proof of a problem.ManifestnonewarnWarning. This check found something worth reading in the findings below. It is not proof of a problem.
Passed. This check ran and found nothing it flags.BuildpassPassed. This check ran and found nothing it flags.
Flagged. This check found an issue. See the findings below.Boot & handshakefailFlagged. This check found an issue. See the findings below.
Not applicable. This check does not apply to this kind of project, or it was not run in this scan.Network egressn/aNot applicable. This check does not apply to this kind of project, or it was not run in this scan.
Not applicable. This check does not apply to this kind of project, or it was not run in this scan.Reproducible (×3)n/aNot applicable. This check does not apply to this kind of project, or it was not run in this scan.
Findings (17)
- highHigh. Something risky that needs a close look before you install.dependencies issueDetails are available to the maintainer after claiming this listing.
- highHigh. Something risky that needs a close look before you install.dependencies issueDetails are available to the maintainer after claiming this listing.
- mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Runs shell commands. Fine for some tools, but it means the agent can run anything your user can.
plugins/n8n/nodes/PromptShield/PromptShield.node.ts:140 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Turns off TLS certificate checking, allowing traffic interception.
src/prompt_shield/engine.py:568 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Turns off TLS certificate checking, allowing traffic interception.
src/prompt_shield/engine.py:574 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Turns off TLS certificate checking, allowing traffic interception.
src/prompt_shield/engine.py:582 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.orjson@3.9.15: 1 known vulnerabilityPYSEC-2026-107
plugins/dify/requirements.txt - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.torch@2.9.1: 4 known vulnerabilitiesPYSEC-2026-139, PYSEC-2026-2286, GHSA-qfhq-4f3w-5fph, GHSA-rrmf-rvhw-rf47
plugins/dify/requirements.txt - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.transformers@5.9.0: 1 known vulnerabilityPYSEC-2026-3929
plugins/dify/requirements.txt - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.MCP server didn't complete the protocol handshakeserver exited early with code 2
- lowLow. Minor, or common in normal tools. Shown for information.In tests/examples/docs: Touches a sensitive credential location (SSH keys, cloud credentials, browser data or wallets). Expected for some tools, such as browser automation; check why.
docs/papers/evaluation/build_held_out_corpus.py:731 - lowLow. Minor, or common in normal tools. Shown for information.Possible example credential in docs/tests: generic-api-key
docs/design-notes-v0.5.0.md:186 - lowLow. Minor, or common in normal tools. Shown for information.Possible example credential in docs/tests: generic-api-key
docs/papers/build_design_notes_v0_5_0.py:581 - lowLow. Minor, or common in normal tools. Shown for information.Possible example credential in docs/tests: stripe-access-token
tests/detectors/test_d023_pii_detection.py:90 - lowLow. Minor, or common in normal tools. Shown for information.Possible example credential in docs/tests: generic-api-key
tests/output_scanners/test_prompt_leakage.py:32 - lowLow. Minor, or common in normal tools. Shown for information.opentelemetry-api@1.9.1: 1 known vulnerabilityGHSA-xcq7-p3pf-p88h
plugins/dify/requirements.txt - lowLow. Minor, or common in normal tools. Shown for information.No manifest declaring network access and environment variables (agent.json)
Network activity
During install
files.pythonhosted.orgpypi.org
While running
Not run — the code wasn't started in this scan
Automated result for the commit shown. See our scan policy. View the scan log
Maintainers can claim the listing to rescan, or dispute a result.
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