CVE-2026-46406
Description
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.
How to fix
- anthropic claude_code2.1.128 or later
- @anthropic-ai/claude-code2.1.128 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| anthropic claude_code | 2.1.58 ≤ v < 2.1.128 | 2.1.128 |
| @anthropic-ai/claude-codenpm | 2.1.59 ≤ v < 2.1.128 | 2.1.128 |
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