Which versions of jonas-prettier-logger are malicious?

Every published version of jonas-prettier-logger on npm is considered malicious. Remove the package entirely.

How do I remediate jonas-prettier-logger if I installed it?

Remove jonas-prettier-logger 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 jonas-prettier-logger — how do I know if it already compromised me?

If jonas-prettier-logger 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.

Is jonas-prettier-logger part of a known attack campaign?

Yes — jonas-prettier-logger is associated with the GHSA-h9fw-29vc-6g89 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 jonas-prettier-logger across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for jonas-prettier-logger (all published versions).

Malicious package

jonas-prettier-loggernpm

Advisory published Apr 1, 2026Updated Apr 7, 2026

jonas-prettier-logger is a confirmed malicious npm package (MAL-2026-2325) that executes malicious code on install. Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in jonas-prettier-logger (npm)

MAL-2026-2325

Immediate action

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

npm uninstall jonas-prettier-logger

What this malware does

The package jonas-prettier-logger 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)

c8ef4cc47cdb4552a303c760c89703e720f736a4082e5f9c29e3bbf7023b3103

28f4e8e2d6e083733be2f7a98647f2a7267b3be203837f3081b4884ef3b926a0

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for jonas-prettier-logger (all published versions).
If you installed it — respond
Remove jonas-prettier-logger 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 jonas-prettier-logger 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. jonas-prettier-logger 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-h9fw-29vc-6g89

References

github.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks jonas-prettier-logger-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

Explore

All malware advisories How O3 detects malware Vulnerability database