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TI-2026-20794 Aliases CVE-2026-25725GHSA-ff64-7w26-62rf

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

Priority LOW 36CWE-501Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Claude Code is an agentic coding tool. Prior to version 2.1.2, 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. This issue has been patched in version 2.1.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00529 44th percentileScored 2026-11-07
Fix Fixed claude-code (anthropics): 2.1.2@anthropic-ai/claude-code (npm): 2.1.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
anthropicsclaude-codebefore 2.1.22.1.2Patch availableCNA
—@anthropic-ai/claude-code (npm)before 2.1.22.1.2Patch availableGHSA-ff64-7w26-62rf
  • claude-code Vendoranthropics Affected before 2.1.2 Fixed in 2.1.2 Patch available CNA
  • @anthropic-ai/claude-code (npm) Vendor— Affected before 2.1.2 Fixed in 2.1.2 Patch available GHSA-ff64-7w26-62rf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*before 2.1.2Vulnerableanthropics
  • cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:* Versions before 2.1.2 Vulnerable ·anthropics

Remediation

  • Fix · CNA claude-code (anthropics) Fixed in 2.1.2
  • Fix · GHSA-ff64-7w26-62rf @anthropic-ai/claude-code (npm) Fixed in 2.1.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25725
  2. 2026-10-03 Alias added: GHSA-ff64-7w26-62rf
  3. 2026-10-04 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 2

Other 1

  • TI-2025-40558 Claude Code Command Validation Bypass Allows Arbitrary Code Execution CVSS 4.0HIGH 8.7
  • TI-2025-36683 Claude Code vulnerable to arbitrary code execution caused by maliciously configured git email CVSS 4.0HIGH 8.7
  • TI-2025-37066 Claude Code's startup trust dialog could lead to Command Execution attack CVSS 4.0HIGH 8.7
  • TI-2026-17554 Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation CVSS 4.0MEDIUM 5.3
  • TI-2025-40093 @anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes CVSS 4.0HIGH 8.7
  • TI-2025-36422 Claude Code rg command had Command Injection that allowed bypass of user approval prompt for command execution CVSS 4.0HIGH 8.7
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences