CVE-2025-64755highBroken access control2025-11-20
CVE-2025-64755: @anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes
Due to an error in sed command parsing, it was possible to bypass the Claude Code read-only validation and write to arbitrary files on the host system.
What it is
Due to an error in sed command parsing, it was possible to bypass the Claude Code read-only validation and write to arbitrary files on the host system.
Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to the latest version.
How to check
- Affected: @anthropic-ai/claude-code (npm) < 2.0.31.
- Compare your installed version with the range above (command below).
How to fix
- Upgrade @anthropic-ai/claude-code to 2.0.31 or later.
npm ls @anthropic-ai/claude-code -g # or: claude --versionSources
More advisories for this tool
- criticalCVE-2026-96620: Claude Agent SDK (Python) resume option lets attackers run commands
- criticalUpGuard: 16,326 Supabase databases had readable tables
- highCVE-2026-86063: Claude Code: Plugin Hash Pin Bypass Allows Bypass of Hash Pinning
- highCVE-2026-103435: Claude Code could be raced into writing files outside the project