AnthropicGHSA-mhg7-666j-cqg4
Command Injection via Piped sed Command Bypasses File Write Restrictions
High7.7CVE-2026-25723 · Published Feb 6, 2026
Claude Code failed to properly validate commands using piped sed operations with the echo command, allowing attackers to bypass file write restrictions. This vulnerability enabled writing to sensitive directories like the .claude folder and paths outside the project scope. Exploiting this required the ability to execute commands through Claude Code with the "accept edits" feature enabled. Users on standard Claude Code auto-update received this fix automatically. Users performing manual updates are advised to update to the latest version. Thank you to hackerone.com/nil221 for reporting this issue!
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| @anthropic-ai/claude-code npm | < v2.0.55 | v2.0.55 |
Details and references
More Anthropic advisories
All Anthropic| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Feb 6 | Command Injection via Directory Change Bypasses Write Protection | High7.7 | v2.0.57 |
| Feb 6 | Sandbox Escape via Persistent Configuration Injection in settings.json | High7.7 | v2.1.2 |
| Feb 6 | Permission Deny Bypass Through Symbolic Links | Low2.3 | v2.1.7 |
| Feb 3 | Command Injection in find Command Bypasses User Approval Prompt | High7.7 | v2.0.72 |
| Feb 3 | Path Restriction Bypass via ZSH Clobber Allows Arbitrary File Writes | High7.7 | v2.0.74 |
| Feb 3 | Domain Validation Bypass Allows Automatic Requests to Attacker-Controlled Domains | High7.1 | v1.0.111 |