jsonschemavalidPyPI
Advisory published Updated
jsonschemavalid is a confirmed malicious PyPI package (MAL-2026-6970) that steals credentials and exfiltrates sensitive data (malicious version 4.26.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in jsonschemavalid (PyPI)
What this malware does
A clone of a legitimate package with an embeded reverse shell. In the published version, the reverse shell was connecting to a private IP address suggesting the package was not yet fully weaponized.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-07-jsonschemavalidation
Reasons (based on the campaign):
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The package contains code to create a reverse shell, allowing an attacker to execute any commands on the victim's machine.
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clones-real-package
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obfuscation
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for jsonschemavalid (version 4.26.0).
If you installed it — respond
jsonschemavalid 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 jsonschemavalid was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Kamil Mańkowski (kam193) · reporter
Detect & block this
O3 blocks jsonschemavalid-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.