AnthropicGHSA-7mv8-j34q-vp7q
Sed Command Validation Bypass Allows Arbitrary File Writes
High8.7CVE-2025-64755 · Published Nov 20, 2025
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. Thank you to Adam Chester - SpecterOps for reporting this issue!
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| @anthropic-ai/claude-code npm | < v2.0.31 | v2.0.31 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-78
More Anthropic advisories
All Anthropic| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Dec 42025 | Network Sandboxing Escape | Low1.8 | 0.0.16 |
| Dec 32025 | Command Validation Bypass Allows Arbitrary Code Execution | High8.7 | v1.0.93 |
| Nov 192025 | Command execution prior to Claude Code startup trust dialog | High7.7 | v1.0.39 |
| Oct 32025 | Command execution prior to Claude Code startup trust dialog | High8.7 | v1.0.111 |
| Oct 32025 | Permission deny bypass through symlink | Low2.3 | v1.0.120 |
| Sep 242025 | Claude Code Vulnerable to Arbitrary Code Execution via Plugin Autoloading with Specific Yarn Versions | High7.7 | v1.0.39 |