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High

Claude Code has Sandbox Escape via Persistent Configuration Injection in settings.json

  • Disclosed: 06.02.2026
  • Updated: 11.10.2026 10:22

Claude Code's bubblewrap sandboxing mechanism failed to properly protect the .claude/settings.json configuration file when it did not exist at startup. While the parent directory was mounted as writable and .claude/settings.local.json was explicitly protected with read-only constraints, settings.json was not protected if it was missing. This allowed malicious code running inside the sandbox to create this file and inject persistent hooks (such as SessionStart commands) that would execute with host privileges when Claude Code was restarted.

Users on standard Claude Code auto-update received this fix automatically. Users performing manual updates are advised to update to the latest version.

Claude Code thanks hackerone.com/edbr for reporting this issue!

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package @anthropic-ai/claude-code < 2.1.2 2.1.2

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE)
CWE-501, CWE-668
Platform
npm
Package
@anthropic-ai/claude-code
Disclosed
06.02.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-ff64-7w26-62rf - 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 this entry
    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 Command Validation Bypass Allows Arbitrary Code Execution
    High CVE-2025-66032 < 1.0.93 1.0.93
  13. @anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes
    High CVE-2025-64755 < 2.0.31 2.0.31
  14. Claude Code vulnerable to command execution prior to startup trust dialog
    High CVE-2025-65099 < 1.0.39 1.0.39
  15. Claude Code can execute commands prior to the startup trust dialog
    High CVE-2025-59536 < 1.0.111 1.0.111
  16. Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions
    High CVE-2025-59828 < 1.0.39 1.0.39
  17. Claude Code vulnerable to arbitrary code execution caused by maliciously configured git email
    High CVE-2025-59041 < 1.0.105 1.0.105
  18. Claude Code rg vulnerability does not protect against approval prompt bypass
    High CVE-2025-58764 < 1.0.105 1.0.105
  19. Claude Code Vulnerable to Arbitrary Code Execution Due to Insufficient Startup Warning
    High ghsa-ph6w-f82w-28w6 < 1.0.87 1.0.87
  20. 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
Show more (3) Showing 20 of 23

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