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      <title>CVE-2026-46406 — Claude Code: Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-46406</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; anthropics claude-code&lt;/p&gt;
&lt;p&gt;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&amp;#39;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; anthropics claude-code&lt;/p&gt;
&lt;p&gt;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&amp;#39;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.&lt;/p&gt;</content:encoded>
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