Malicious Package Affecting chalk package, versions >5.6.0 <5.6.2
Threat Intelligence
Snyk has reported that there have been attempts or successful attacks targeting this vulnerability.
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Test your applications- Snyk IDSNYK-JS-CHALK-12552897
- published8 Sept 2025
- disclosed8 Sept 2025
- creditUnknown
Introduced: 8 Sep 2025
New Malicious CVE NOT AVAILABLE CWE-506 (opens in a new tab)How to fix?
Avoid using all malicious instances of the chalk package.
Overview
chalk is a malicious package. This package version contains malicious code that listens for network traffic when run in the context of a browser and focuses on crypto transactions. The malicious code injected to the packages activates a hook whenever a Web3 wallet is present. Once activated the code intercepts and modifies any transaction with ETH value and points it to another address presumably controlled by the attacker. The malicious code also listens for swap/transfer transactions to tamper with as well.
Note:
This advisory is under ongoing investigation and can be updated with additional details.