PostHog Details “Most Impactful” Security Breach as Shai-Hulud 2.0 npm Worm Spreads Through JavaScript SDKs

PostHog has described the Shai-Hulud 2.0 npm worm incident as “the largest and most impactful security incident” the company has ever faced, after attackers managed to push tainted versions of its JavaScript SDKs and attempted to automatically harvest developer credentials.

In a recently published postmortem, PostHog — one of the affected maintainers caught up in the Shai-Hulud 2.0 outbreak — revealed that multiple packages, including core libraries such as posthog-node, posthog-js, and posthog-react-native, were compromised. The malicious versions included a pre-install script that ran the moment the package was added to a project. This script executed TruffleHog to search for secrets, exported any discovered credentials to newly created public GitHub repositories, and then used the stolen npm tokens to publish additional malicious updates, allowing the worm to continue spreading.

Researchers at Wiz, who identified the resurgence of the Shai-Hulud campaign, reported that more than 25,000 developers had their credentials exposed within just three days. Beyond PostHog, the malware also infiltrated packages from Zapier, AsyncAPI, ENS Domains, and Postman — many of which receive thousands of downloads every week.

Unlike a standard trojan, Shai-Hulud 2.0 operates like a fully autonomous worm. Once a compromised package is installed, it can coll

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