Security Advisory

CVE-2026-21852

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-01-21 20:42:06

Last updated 2026-01-21 21:34:43

Assigner GitHub_M

State PUBLISHED

Description

Claude Code is an agentic coding tool. Prior to version 2.0.65, vulnerability in Claude Codes 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 users 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.

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