Claude Code is an agentic coding tool. Prior to version 2.1.2, Claude Codes 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.
Weakness
The product mixes trusted and untrusted data in the same data structure or structured message.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Claude_code | Anthropic | * | 2.1.2 (excluding) |