Which versions of @posthog/url-normalizer-plugin are malicious?

The following npm versions of @posthog/url-normalizer-plugin are flagged malicious: 0.0.8. Treat any of these as compromised.

How do I remediate @posthog/url-normalizer-plugin if I installed it?

@posthog/url-normalizer-plugin 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 @posthog/url-normalizer-plugin — how do I know if it already compromised me?

If @posthog/url-normalizer-plugin 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.

How do I find @posthog/url-normalizer-plugin across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @posthog/url-normalizer-plugin (version 0.0.8).

Part of a larger attack: @posthog published 56 malicious packages. See the full campaign →

Malicious package

@posthog/url-normalizer-pluginnpm

Advisory published Nov 24, 2025Updated Nov 26, 2025

@posthog/url-normalizer-plugin is a confirmed malicious npm package (MAL-2025-190897) that steals credentials and exfiltrates sensitive data (malicious version 0.0.8). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @posthog/url-normalizer-plugin (npm)

MAL-2025-190897

Immediate action

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

npm uninstall @posthog/url-normalizer-plugin

What this malware does

The package @posthog/url-normalizer-plugin was found to contain malicious code.

This package was compromised by the Sha1-Hulud: The Second Coming NPM worm. The malicious payload steals tokens and credentials and publishes them to GitHub. The worm will propogate itself to NPM packages the user owns and establish persistence is a GitHub action. The package may also destroy the user's home directory.

Malicious versions

1 flagged

0.0.8

Indicators of compromise (SHA-256)

3af45430785d7a562e6a3ccfe29b377e17c6c71d4bbcefa7a8e4fc67e95977c8

844f553091ce5d549c8a651d2dc0f42c287c5ca76ae23cedb9922b3d6183eac1

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for @posthog/url-normalizer-plugin (version 0.0.8).
If you installed it — respond
@posthog/url-normalizer-plugin 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 @posthog/url-normalizer-plugin 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. @posthog/url-normalizer-plugin on npm has been identified as a malicious package (version 0.0.8 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks @posthog/url-normalizer-plugin-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

All malware advisories How O3 detects malware Vulnerability database