CVE-2026-46406
CVE-2026-46406 · Claude Code: Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Claude Code is an agentic coding tool. From 2.1.59 until 2.1.128, the Claude Code /copy command wrote responses to a hardcoded, predictable path (/tmp/claude/response.md) without UID isolation, randomness, or symlink protection. The file was created world-readable (0644) in a world-traversable directory (0755), allowing any local user to read a privileged user's Claude response, which could contain secrets or credentials. Additionally, because the path was static and predictable, a local attacker could pre-create the directory and plant a symlink at the expected file path, causing the privileged process to follow the symlink and overwrite an attacker-chosen file with the response text. Exploiting this required a local unprivileged user on the same system and a privileged user to run the /copy command. This vulnerability is fixed in 2.1.128.
CVSS 4.4 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
claude-code
- Versions
- >= 2.1.59, < 2.1.128: Affected
No fix published
@anthropic-ai/claude-code npm
- Affected ranges
- SEMVER: ≥ 2.1.59, < 2.1.128
Update to 2.1.128