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Malicious package

jsonconfig-utilsPyPI

Advisory published Updated

jsonconfig-utils is a confirmed malicious PyPI package (MAL-2026-849) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.3, 1.0.4, 1.0.5…). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in jsonconfig-utils (PyPI)

MAL-2026-849
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall jsonconfig-utils

What this malware does

During installation, package installs a script that listens for remote commands and executes them. The script is also added to autostart configuration and disguised as system application

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

Campaign: 2026-02-devtools-webhook-cicd-utils

Reasons (based on the campaign):

  • The package overrides the install command in setup.py to execute malicious code during installation.

  • peristence-autorun

  • The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.

  • obfuscation

Malicious versions

9 flagged
1.0.31.0.41.0.51.0.61.0.71.0.81.0.91.0.101.0.11

Indicators of compromise (SHA-256)

883897a307b53ac17e981eac46b8d6f8c31d88fc2628c6d57c5f7f191ed84b81

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for jsonconfig-utils (9 malicious versions).

  2. If you installed it — respond

    jsonconfig-utils 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.

  3. Did it already run?

    If jsonconfig-utils 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

No. jsonconfig-utils on PyPI has been identified as a malicious package (versions 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, and 1 more flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-02-devtools-webhook-cicd-utils

References

Credits

  • Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks jsonconfig-utils-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

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jsonconfig-utils (PyPI) malicious package — MAL-2026-849 | O3 Security