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Medium

Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation

  • Disclosed: 21.01.2026
  • Updated: 11.10.2026 10:22

A vulnerability in Claude Code's project-load flow allowed malicious repositories to exfiltrate data including Anthropic API keys before users confirmed trust. If a user started Claude Code in an attacker-controller repository, and the repository included a settings file that set ANTHROPIC_BASE_URL to an attacker-controlled endpoint, Claude Code would issue API requests before showing the trust prompt, including 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 the latest version.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package @anthropic-ai/claude-code < 2.0.65 2.0.65

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-522
Platform
npm
Package
@anthropic-ai/claude-code
Disclosed
21.01.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-jh7p-qr78-84p7 - CC BY 4.0

Vulnerability history: @anthropic-ai/claude-code

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (29) in the archive
Total entries
29
First → latest
06.2025 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 23
  • Medium 4
  • Low 2

Disclosures per year

Severity:
  1. Claude Code: Plugin Hash Pin Bypass Allows Bypass of Hash Pinning
    High CVE-2026-86063 < 2.1.179 2.1.179
  2. Claude Code: Sandbox Escape via Git Worktree Path Confusion Allows Unsandboxed Code Execution
    High CVE-2026-55607 >= 2.1.38, < 2.1.163 2.1.163
  3. Claude Code: Trust Dialog Bypass via Git Worktree Spoofing Allows Arbitrary Code Execution
    High CVE-2026-40068 >= 2.1.63, < 2.1.84 2.1.84
  4. Claude Code: Sandbox Escape via Symlink Following Allows Arbitrary File Write Outside Workspace
    High · 10.0 CVE-2026-39861 < 2.1.64 2.1.64
  5. Claude Code has a Workspace Trust Dialog Bypass via Repo-Controlled Settings File
    High CVE-2026-33068 < 2.1.53 2.1.53
  6. Claude Code has Sandbox Escape via Persistent Configuration Injection in settings.json
    High CVE-2026-25725 < 2.1.2 2.1.2
  7. Claude Code Vulnerable to Command Injection via Piped sed Command Bypasses File Write Restrictions
    High CVE-2026-25723 < 2.0.55 2.0.55
  8. Claude Code Vulnerable to Command Injection via Directory Change Bypasses Write Protection
    High CVE-2026-25722 < 2.0.57 2.0.57
  9. Claude Code has a Command Injection in find Command Bypasses User Approval Prompt
    High CVE-2026-24887 < 2.0.72 2.0.72
  10. Claude Code has a Path Restriction Bypass via ZSH Clobber which Allows Arbitrary File Writes
    High CVE-2026-24053 < 2.0.74 2.0.74
  11. Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains
    High CVE-2026-24052 < 1.0.111 1.0.111
  12. Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation this entry
    Medium CVE-2026-21852 < 2.0.65 2.0.65
  13. Claude Code Command Validation Bypass Allows Arbitrary Code Execution
    High CVE-2025-66032 < 1.0.93 1.0.93
  14. @anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes
    High CVE-2025-64755 < 2.0.31 2.0.31
  15. Claude Code vulnerable to command execution prior to startup trust dialog
    High CVE-2025-65099 < 1.0.39 1.0.39
  16. Claude Code can execute commands prior to the startup trust dialog
    High CVE-2025-59536 < 1.0.111 1.0.111
  17. Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions
    High CVE-2025-59828 < 1.0.39 1.0.39
  18. Claude Code vulnerable to arbitrary code execution caused by maliciously configured git email
    High CVE-2025-59041 < 1.0.105 1.0.105
  19. Claude Code rg vulnerability does not protect against approval prompt bypass
    High CVE-2025-58764 < 1.0.105 1.0.105
  20. Claude Code Vulnerable to Arbitrary Code Execution Due to Insufficient Startup Warning
    High ghsa-ph6w-f82w-28w6 < 1.0.87 1.0.87
  21. Claude Code's Permissive Default Allowlist Enables Unauthorized File Read and Network Exfiltration in Claude Code
    High CVE-2025-55284 < 1.0.4 1.0.4
  22. Claude Code echo command allowed bypass of user approval prompt for command execution
    High CVE-2025-54795 < 1.0.20 1.0.20
  23. Claude Code Research Preview has a Path Restriction Bypass which could allow unauthorized file access
    High CVE-2025-54794 < 0.2.111 0.2.111
  24. Claude Code Improper Authorization via websocket connections from arbitrary origins
    High CVE-2025-52882 >= 0.2.116, < 1.0.24 1.0.24

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