Claude Code is an agentic coding tool. Prior to 2.1.251, the Edit tool validates a target using pathname and symlink resolution that is not bound to the underlying directory inode or file descriptor. On macOS, attacker-controlled code running in the Bash sandbox can atomically replace an in-workspace parent directory with a symlink after validation, causing the unsandboxed Edit implementation to overwrite a user-writable file outside the workspace. Exploitation requires attacker-controlled code to run inside the sandbox, such as from a malicious repository or dependency script. This issue is fixed in version 2.1.251.
| Version | Type | Source | Base | Exp | Imp |
|---|---|---|---|---|---|
| 4.0 | Secondary | NVD | 7.7 | — | — |
| 4.0 | Secondary | ENISA EUVD | 7.7 | — | — |