Arbitrary Code Injection Affecting @anthropic-ai/claude-code package, versions <1.0.39
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Nov 2025
- disclosed19 Nov 2025
- creditBenjamin Faller, Redguard AG, Michael Hess
Introduced: 19 Nov 2025
NewCVE-2025-65099 (opens in a new tab)How to fix?
Upgrade @anthropic-ai/claude-code to version 1.0.39 or higher.
Overview
@anthropic-ai/claude-code is an Use Claude, Anthropic's AI assistant, right from your terminal. Claude can understand your codebase, edit files, run terminal commands, and handle entire workflows for you.
Affected versions of this package are vulnerable to Arbitrary Code Injection via yarn plugins. An attacker can execute arbitrary code by convincing a user to start the application in an untrusted directory while using Yarn 3.0 or above, before the user accepts the startup trust dialog. This is only exploitable if the user initiates the application in an untrusted directory and is using Yarn version 3.0 or higher.