Which versions of jsonschema-viewer are malicious?

The following PyPI versions of jsonschema-viewer are flagged malicious: 0.1.0. Treat any of these as compromised.

How do I remediate jsonschema-viewer if I installed it?

jsonschema-viewer is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed jsonschema-viewer — how do I know if it already compromised me?

If jsonschema-viewer was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is jsonschema-viewer part of a known attack campaign?

Yes — jsonschema-viewer is associated with the 2026-06-jsonschema-viewer campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find jsonschema-viewer across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for jsonschema-viewer (version 0.1.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging jsonschema-viewer across your stack and pipelines.

Malicious package

jsonschema-viewerPyPI

Malicious code in jsonschema-viewer (PyPI) Remove it immediately and rotate any exposed credentials.

MAL-2026-6248

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

pip uninstall jsonschema-viewer

What this malware does

Package configures an entry point (command line) that executes a remote script. It then downloads a next stage malware, which acts as next dropper for a fileless malware.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-06-jsonschema-viewer

Reasons (based on the campaign):

malware
Downloads and executes a remote executable.
Downloads and executes a remote malicious script.

Malicious versions

1 flagged

0.1.0

Indicators of compromise (SHA-256)

76cad60a803b91e4da8eb438787ca5f044fd3deafedef5de1fdb4e92bd8fd9e1

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for jsonschema-viewer (version 0.1.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging jsonschema-viewer across your stack and pipelines.
If you installed it — respond
jsonschema-viewer is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If jsonschema-viewer was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks jsonschema-viewer before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. jsonschema-viewer on PyPI has been identified as a malicious package (version 0.1.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-06-jsonschema-viewer

References

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks jsonschema-viewer-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring