Claude Code — Vulnerability (CVE-2026-46406)
Date: 2026-06
Affected: anthropic/claude_code
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-46406
CWE: CWE-200
CWE-377
CWE-59
CVSS: 6.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H)

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.


Mitigations:

Architectural layers (MAESTRO):