MCP Server Fuzzer
by tavric-labsBlack-box security assessment for live MCP servers.
MCP Server Fuzzer is an open-source mcp server by tavric-labs, written mainly in Python, with 46 GitHub stars and the MIT license. Its code was last updated Oct 23, 2026.
Scan summary: scanned Nov 5, 2026 at commit 019cb61. Seen able to read environment and secrets, 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
019cb61 · 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 audit115 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.
Not applicable. This check does not apply to this kind of project, or it was not run in this scan.Boot & handshaken/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.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 (38)
- highHigh. Something risky that needs a close look before you install.credential-access 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.
- 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.
- 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.
- 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.
- 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.Contacts a hard-coded IP address instead of a domain name.
mcp_fuzzer/fuzz_engine/mutators/strategies/interesting_values.py:135 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Contacts a hard-coded IP address instead of a domain name.
mcp_fuzzer/fuzz_engine/mutators/strategies/interesting_values.py:137 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Contacts a hard-coded IP address instead of a domain name.
mcp_fuzzer/fuzz_engine/mutators/strategies/interesting_values.py:139 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Contacts a hard-coded IP address instead of a domain name.
mcp_fuzzer/fuzz_engine/mutators/strategies/interesting_values.py:140 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.Contacts a hard-coded IP address instead of a domain name.
mcp_fuzzer/fuzz_engine/mutators/strategies/interesting_values.py:318 - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.@modelcontextprotocol/sdk@1.29.0: 6 known vulnerabilitiesGHSA-22jm-h49p-29qw, GHSA-46jr-4wx8-v453, GHSA-6prh-2h8m-c8cw, GHSA-6qxp-vccf-f47h, GHSA-f897-62hf-6gxq +1 more
examples/typescript-stdio-server/package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.body-parser@2.2.2: 2 known vulnerabilitiesGHSA-27r3-jxmh-p828, GHSA-v422-hmwv-36x6
examples/typescript-stdio-server/package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.fast-uri@3.1.2: 11 known vulnerabilitiesGHSA-333x-w4r6-6crp, GHSA-4c8g-83qw-93j6, GHSA-7p8r-x3mc-p8w7, GHSA-f65p-4m7j-42xc, GHSA-fph4-wmhf-6fwf +6 more
examples/typescript-stdio-server/package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.hono@4.12.23: 17 known vulnerabilitiesGHSA-54fx-42gc-7vw4, GHSA-5r4p-p66f-jhc7, GHSA-79qm-7rj5-m7r9, GHSA-88fw-hqm2-52qc, GHSA-8j4g-w8fx-2239 +12 more
examples/typescript-stdio-server/package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.ip-address@10.2.0: 8 known vulnerabilitiesGHSA-22jq-vg5j-6vgg, GHSA-2vr4-cq9g-pvrc, GHSA-4xrf-jv44-h6hh, GHSA-h3mg-xc3c-68pw, GHSA-j6r3-76f7-8jcv +3 more
examples/typescript-stdio-server/package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.zod@3.25.76: 1 known vulnerabilityGHSA-mrhx-c7xc-m3w5
examples/typescript-stdio-server/package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.lodash-es@4.17.21: 2 known vulnerabilitiesGHSA-r5fr-rjxr-66jc, GHSA-xxjr-mmjv-4gpg
package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.uuid@9.0.1: 1 known vulnerabilityGHSA-w5hq-g745-h8pq
package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.vite@5.4.21: 8 known vulnerabilitiesGHSA-4w7w-66w2-5vf9, GHSA-587h-7wmj-h5pm, GHSA-698v-4r3x-3vcv, GHSA-9jrq-w75r-8gcw, GHSA-fx2h-pf6j-xcff +3 more
package-lock.json - mediumMedium. Worth checking, often a vulnerable dependency or a setup problem.virtualenv@20.36.1: 19 known vulnerabilitiesPYSEC-2026-4011, PYSEC-2026-4012, PYSEC-2026-4013, PYSEC-2026-4014, GHSA-394h-qwmc-48pf +14 more
uv.lock - lowLow. Minor, or common in normal tools. Shown for information.pygments@2.19.2: 4 known vulnerabilitiesPYSEC-2026-2987, PYSEC-2026-2987, PYSEC-2026-2987, PYSEC-2026-2987
docker/requirements.runtime.txt - lowLow. Minor, or common in normal tools. Shown for information.idna@3.9.0: 1 known vulnerabilityPYSEC-2026-215
docker/requirements.runtime.txt - lowLow. Minor, or common in normal tools. Shown for information.golang.org/x/sys@0.41.0: 1 known vulnerabilityGO-2026-5024
examples/go_stdio_server/go.mod - lowLow. Minor, or common in normal tools. Shown for information.@hono/node-server@1.19.14: 2 known vulnerabilitiesGHSA-frvp-7c67-39w9, GHSA-rmxm-3fg6-px4f
examples/typescript-stdio-server/package-lock.json - lowLow. Minor, or common in normal tools. Shown for information.qs@6.15.2: 3 known vulnerabilitiesGHSA-4mjr-xmp4-gh2g, GHSA-6pq8-jhm2-2vcw, GHSA-x5fp-wj9c-mxmx
examples/typescript-stdio-server/package-lock.json - lowLow. Minor, or common in normal tools. Shown for information.esbuild@0.21.5: 1 known vulnerabilityGHSA-67mh-4wv8-2f99
package-lock.json - lowLow. Minor, or common in normal tools. Shown for information.katex@0.16.47: 1 known vulnerabilityGHSA-238p-pmpm-9mq7
package-lock.json - lowLow. Minor, or common in normal tools. Shown for information.mermaid@11.4.1: 9 known vulnerabilitiesGHSA-2v8p-3f2j-5mp7, GHSA-6m6c-36f7-fhxh, GHSA-6x64-9x62-f2gx, GHSA-7rqq-prvp-x9jh, GHSA-87f9-hvmw-gh4p +4 more
package-lock.json - lowLow. Minor, or common in normal tools. Shown for information.idna@3.11.0: 1 known vulnerabilityPYSEC-2026-215
requirements.txt - lowLow. Minor, or common in normal tools. Shown for information.filelock@3.20.3: 2 known vulnerabilitiesGHSA-69hj-f68j-2879, GHSA-8mx5-7m5m-r77g
uv.lock - lowLow. Minor, or common in normal tools. Shown for information.idna@3.11: 1 known vulnerabilityPYSEC-2026-215
uv.lock - lowLow. Minor, or common in normal tools. Shown for information.pytest@9.0.2: 1 known vulnerabilityPYSEC-2026-1845
uv.lock - lowLow. Minor, or common in normal tools. Shown for information.No manifest declaring network access and environment variables (agent.json)
- lowLow. Minor, or common in normal tools. Shown for information.Couldn't work out how to start the server. Set "entrypoint" in agent.json.
Network activity
During install
codeload.github.comgithub.comregistry.npmjs.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
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