Which versions of pretty-jsonify are malicious?

Every published version of pretty-jsonify on npm is considered malicious. Remove the package entirely.

How do I remediate pretty-jsonify if I installed it?

Remove pretty-jsonify from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

I already installed pretty-jsonify — how do I know if it already compromised me?

If pretty-jsonify 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 pretty-jsonify part of a known attack campaign?

Yes — pretty-jsonify is associated with the GHSA-f2g5-jc9j-vfp5 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 pretty-jsonify 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 pretty-jsonify (all published versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging pretty-jsonify across your stack and pipelines.

Malicious package

pretty-jsonifynpm

Malicious code in pretty-jsonify (npm) Remove it immediately and rotate any exposed credentials.

MAL-2025-190554

Immediate action

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

npm uninstall pretty-jsonify

What this malware does

The package pretty-jsonify was found to contain malicious code.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

all versions

Every published version of this package is considered malicious — remove it entirely.

Indicators of compromise (SHA-256)

649213f861633958745285a1555fc21e61fa6cdc511641465cfa66e4317a7373

448c877af04a46d01d52e722de63fc0f986a877952bfc332c784d6b054b144ea

Detection & response playbook

Malicious package

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for pretty-jsonify (all published versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging pretty-jsonify across your stack and pipelines.
If you installed it — respond
Remove pretty-jsonify from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If pretty-jsonify 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 pretty-jsonify 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. pretty-jsonify on npm has been identified as a malicious package (all published versions flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-f2g5-jc9j-vfp5

References

github.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks pretty-jsonify-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring