CVE-2025-65099
Critical
Description
Claude Code is an agentic coding tool. Prior to version 1.0.39, when running on a machine with Yarn 3.0 or above, Claude Code could have been tricked to execute code contained in a project via yarn plugins before the user accepted the startup trust dialog. Exploiting this would have required a user to start Claude Code in an untrusted directory and to be using Yarn 3.0 or above. This issue has been patched in version 1.0.39.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Anthropic Claude Code
PublishedNov 19, 2025
First seenNov 19, 2025
Weakness typeCWE-94Code injection
How to fix
Update
- anthropic claude_code1.0.39 or later
- @anthropic-ai/claude-code1.0.39 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| anthropic claude_code | v < 1.0.39 | 1.0.39 |
| @anthropic-ai/claude-codenpm | v < 1.0.39 | 1.0.39 |
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