Which versions of yamlformatter-utils are malicious?

The following PyPI versions of yamlformatter-utils are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate yamlformatter-utils if I installed it?

yamlformatter-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.

I already installed yamlformatter-utils — how do I know if it already compromised me?

If yamlformatter-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.

Is yamlformatter-utils part of a known attack campaign?

Yes — yamlformatter-utils is associated with the 2026-08-ekx-report-utils 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 yamlformatter-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for yamlformatter-utils (version 1.0.0).

Malicious package

yamlformatter-utilsPyPI

Advisory published Aug 28, 2026Updated Aug 28, 2026

yamlformatter-utils is a confirmed malicious PyPI package (MAL-2026-14590) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in yamlformatter-utils (PyPI)

MAL-2026-14590

Immediate action

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

pip uninstall yamlformatter-utils

What this malware does

During import, the package collects sensitive information and exfiltrates it using DNS queries.

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

Campaign: 2026-08-ekx-report-utils

Reasons (based on the campaign):

targetted-attack
exfiltration-generic
exfiltration-credentials

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

ef2cbf7d7c360d11860ea9383a1ed84b491e75361f994359fd97284a5d25cdc2

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for yamlformatter-utils (version 1.0.0).
If you installed it — respond
yamlformatter-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.
Did it already run?
If yamlformatter-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. yamlformatter-utils on PyPI has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-08-ekx-report-utils

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks yamlformatter-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

Explore

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