GHSA-mhg7-666j-cqg4
Claude Code Vulnerable to Command Injection via Piped sed Command Bypasses File Write Restrictions
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @anthropic-ai/claude-code | < 2.0.55 | 2.0.55 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
Claude Code thanks hackerone.com/nil221 for reporting this issue!
References
External links from the advisory. They lead to third-party sites.