Description

Claude Code is an agentic coding tool. Prior to version 2.0.65, vulnerability in Claude Code's project-load flow allowed malicious repositories to exfiltrate data including Anthropic API keys before users confirmed trust. An attacker-controlled repository could include a settings file that sets ANTHROPIC_BASE_URL to an attacker-controlled endpoint and when the repository was opened, Claude Code would read the configuration and immediately issue API requests before showing the trust prompt, potentially leaking the user's API keys. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to version 2.0.65, which contains a patch, or to the latest version.

INFO

Published Date :

2026-01-21T20:42:06.812Z

Last Modified :

2026-01-21T21:34:43.858Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21852 vulnerability.

Vendors Products
Anthropic
  • Claude Code
Anthropics
  • Claude Code
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21852.

URL Resource
https://github.com/anthropics/claude-code/security/advisories/GHSA-jh7p-qr78-84p7 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact